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src="https://allthingsaafs.com/wp-content/uploads/2016/01/header23.png" width="1015" height="237" alt="" /> </a> </div> <section id="primary" class="content-area"> <div id="content" class="site-content" role="main"> <header class="page-header"> <h1 class="page-title"> Primatology </h1> </header> <article id="post-1204" class="post-1204 post type-post status-publish format-standard hentry category-anthropology category-archaeology category-palaeontology-archaeology category-primatology category-unusual-anthropology category-unusual-archaeology-unusual-ology category-unusual-ology tag-ancient-egypt tag-animal-abuse-in-archaeology tag-animal-remains tag-animal-skeletal-remains tag-animals-in-ancient-egypt tag-animals-in-archaeology tag-anthropology tag-archaeological tag-archaeology tag-egypt tag-egyptian-animal-cemetery tag-exotic-animals-in-archaeology tag-hierakonpolis tag-international-journal-of-osteoarchaeology tag-osteoarchaeology tag-palaeontology tag-paleontology tag-parry-fracture tag-richard-redding tag-skeletal-remains tag-unusual tag-unusual-archaeology tag-unusual-ology tag-van-neer tag-wim-van-neer"> <header class="entry-header"> <div class="entry-meta"> <a href="https://allthingsaafs.com/2015/06/30/unusual-ology-wasnt-curiosity-that-killed-the-baboon-ancient-egyptian-pet-cemetery-found/" title="6:05 pm" rel="bookmark"><time class="entry-date" datetime="2015-06-30T18:05:00+01:00" pubdate>30/06/2015</time></a><span class="byline"> by <span class="author vcard"><a class="url fn n" href="https://allthingsaafs.com/author/rosemaryhelenmayne/" title="View all posts by All Things AAFS!" rel="author">All Things AAFS!</a></span></span> </div> <h1 class="entry-title"><a href="https://allthingsaafs.com/2015/06/30/unusual-ology-wasnt-curiosity-that-killed-the-baboon-ancient-egyptian-pet-cemetery-found/" rel="bookmark">Unusual-ology: Wasn’t Curiosity That Killed The Baboon… – Ancient Egyptian Pet Cemetery Found.</a></h1> </header> <div class="entry-content"> <p>A team of archaeologists in Hierakonpolis have unearthed an ancient Egyptian animal cemetery, which has uncovered the remains of numerous exotic animals. The skeletal remains of numerous baboons, hippos, and other animals, have depicted a dark past for these companions of the ancient Egyptian elite.</p> <p>The skeletal remains of the pets, thought to have been buried more than five thousand years ago, revealed numerous broken bones and fractures, which points to them having received harsh beatings. At least two of the baboon skeletons that were discovered had <a href="https://allthingsaafs.com/2013/09/01/quick-tips-named-fractures-part-one-hand-fingers/" target="_blank">parry fractures, a common fracture of the ulna, caused when a victim is trying to shield their heads from damaging bones</a>.</p> <div data-shortcode="caption" id="attachment_1206" style="width: 485px" class="wp-caption aligncenter"><img aria-describedby="caption-attachment-1206" data-attachment-id="1206" data-permalink="https://allthingsaafs.com/2015/06/30/unusual-ology-wasnt-curiosity-that-killed-the-baboon-ancient-egyptian-pet-cemetery-found/animalcemetery2/#main" data-orig-file="https://allthingsaafs.com/wp-content/uploads/2015/06/animalcemetery2.jpg" data-orig-size="676,724" data-comments-opened="1" data-image-meta="{"aperture":"0","credit":"","camera":"","caption":"","created_timestamp":"0","copyright":"","focal_length":"0","iso":"0","shutter_speed":"0","title":"","orientation":"0"}" data-image-title="AnimalCemetery2" data-image-description="" data-image-caption="<p>The skeletal remains of the pets, thought to have been buried more than five thousand years ago, revealed numerous broken bones and fractures, which points to them having received harsh beatings. ©Renee Friedman</p> " data-medium-file="https://allthingsaafs.com/wp-content/uploads/2015/06/animalcemetery2.jpg?w=280" data-large-file="https://allthingsaafs.com/wp-content/uploads/2015/06/animalcemetery2.jpg?w=660" class="wp-image-1206" src="https://allthingsaafs.com/wp-content/uploads/2015/06/animalcemetery2.jpg?w=475&h=509" alt="The skeletal remains of the pets, thought to have been buried more than five thousand years ago, revealed numerous broken bones and fractures, which points to them having received harsh beatings. ©Renee Friedman" width="475" height="509" srcset="https://allthingsaafs.com/wp-content/uploads/2015/06/animalcemetery2.jpg?w=475 475w, https://allthingsaafs.com/wp-content/uploads/2015/06/animalcemetery2.jpg?w=140 140w, https://allthingsaafs.com/wp-content/uploads/2015/06/animalcemetery2.jpg?w=280 280w, https://allthingsaafs.com/wp-content/uploads/2015/06/animalcemetery2.jpg 676w" sizes="(max-width: 475px) 100vw, 475px" /><p id="caption-attachment-1206" class="wp-caption-text">The skeletal remains of the pets, thought to have been buried more than five thousand years ago, revealed numerous broken bones and fractures, which points to them having received harsh beatings. ©Renee Friedman</p></div> <p>The skeletal remains of a hippo calf showed evidence of a broken leg, which is thought to have been caused from the animal trying to free itself from a tether. This isn’t the only tether related injury that was discovered at the site; an antelope and a cow also showed similar injuries. The excavations at the Hierakonpolis site also revealed the remains of two elephants, two crocodiles, a leopard, and nine other exotic species. It is thought that the burial ground near to the Nile is the only archaeological evidence of such a wide assortment of zoo animals within ancient Egypt.</p> <p>Wim Van Neer, a zooarchaeologist from the Royal Belgian Institute of Natural Sciences, noted that the ancient zookeepers “clearly had difficulty maintaining these animals”. The analysis of the skeletal remains showed that “the practical means of keeping animals in captivity were not so sophisticated as nowadays,” which would account for the numerous injuries sustained by the animals. The animals’ injuries showed signs of healing, which suggests that they were kept in captivity for a further several weeks or longer, rather than being killed immediately after obtaining them.</p> <div data-shortcode="caption" id="attachment_1205" style="width: 670px" class="wp-caption aligncenter"><img aria-describedby="caption-attachment-1205" data-attachment-id="1205" data-permalink="https://allthingsaafs.com/2015/06/30/unusual-ology-wasnt-curiosity-that-killed-the-baboon-ancient-egyptian-pet-cemetery-found/animalcemetery1/#main" data-orig-file="https://allthingsaafs.com/wp-content/uploads/2015/06/animalcemetery1.jpg" data-orig-size="676,507" data-comments-opened="1" data-image-meta="{"aperture":"0","credit":"","camera":"","caption":"","created_timestamp":"0","copyright":"","focal_length":"0","iso":"0","shutter_speed":"0","title":"","orientation":"0"}" data-image-title="AnimalCemetery1" data-image-description="" data-image-caption="<p>It is thought that the burial ground near to the Nile is the only archaeological evidence of such a wide assortment of zoo animals within ancient Egypt. ©Renee Friedman</p> " data-medium-file="https://allthingsaafs.com/wp-content/uploads/2015/06/animalcemetery1.jpg?w=300" data-large-file="https://allthingsaafs.com/wp-content/uploads/2015/06/animalcemetery1.jpg?w=660" class="wp-image-1205 size-large" src="https://allthingsaafs.com/wp-content/uploads/2015/06/animalcemetery1.jpg?w=660&h=495" alt="It is thought that the burial ground near to the Nile is the only archaeological evidence of such a wide assortment of zoo animals within ancient Egypt. ©Renee Friedman" width="660" height="495" srcset="https://allthingsaafs.com/wp-content/uploads/2015/06/animalcemetery1.jpg?w=660 660w, https://allthingsaafs.com/wp-content/uploads/2015/06/animalcemetery1.jpg?w=150 150w, https://allthingsaafs.com/wp-content/uploads/2015/06/animalcemetery1.jpg?w=300 300w, https://allthingsaafs.com/wp-content/uploads/2015/06/animalcemetery1.jpg 676w" sizes="(max-width: 660px) 100vw, 660px" /><p id="caption-attachment-1205" class="wp-caption-text">It is thought that the burial ground near to the Nile is the only archaeological evidence of such a wide assortment of zoo animals within ancient Egypt. ©Renee Friedman</p></div> <p>It is argued by Richard Redding, an archaeologist of the University of Michigan’s Kelsey Museum, that the animals’ struggle whilst being captured could have led to the injuries. Van Neer agrees that some of the injuries could have been caused by the struggle, but the forty-plus broken hand and feet bones observed on the baboon remains are just “too numerous to be due to capture”. Van Neer also pointed out that an escaping baboon would have been more likely to break the long bones rather than the metatarsals and metacarpals, whilst escaping the capturers. It is also stated that the baboon remains from more recent tombs display fewer signs of harsh treatment, which may be due to the ancient zookeepers developing better animal keeping techniques.</p> <p><strong>References:</strong></p> <p>Van Neer, W. 2015. <em>International Journal of Osteoarchaeology, </em>25:3. 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tag-anthropological tag-anthropology tag-anthropology-students tag-applied-anthropology tag-archaeology tag-archaeology-students tag-australopithecus-africanus tag-bioarchaeology tag-bones tag-chimpanzees tag-evolution-of-the-hand tag-forensic-anthropology tag-habitual-tool-use tag-hominids tag-hominin-metacarpals tag-hominins tag-human-spongy-bone-pattern tag-human-like-hand-use-in-australopithecus-africanus tag-matthew-skinner tag-modern-human-like-tool-use tag-osteology tag-palaeontology tag-paleontology tag-past-populations tag-pleistocene tag-skeletal-remains tag-stone-tools tag-tool-use tag-tool-use-in-hominids"> <header class="entry-header"> <div class="entry-meta"> <a href="https://allthingsaafs.com/2015/01/25/3-million-year-old-fossilised-metacarpals-show-evidence-of-tool-use/" title="4:55 pm" rel="bookmark"><time class="entry-date" datetime="2015-01-25T16:55:20+00:00" pubdate>25/01/2015</time></a><span class="byline"> by <span class="author vcard"><a class="url fn n" href="https://allthingsaafs.com/author/rosemaryhelenmayne/" title="View all posts by All Things AAFS!" rel="author">All Things AAFS!</a></span></span> </div> <h1 class="entry-title"><a href="https://allthingsaafs.com/2015/01/25/3-million-year-old-fossilised-metacarpals-show-evidence-of-tool-use/" rel="bookmark">3-Million Year Old Fossilised Metacarpals Show Evidence of Tool Use.</a></h1> </header> <div class="entry-content"> <p>A recent study has put forward some important evidence of early human ancestors, in particular <em>Australopithecus africanus,</em> wielding tools in a human like fashion dating around 3 to 2-million years ago.</p> <div data-shortcode="caption" id="attachment_1126" style="width: 509px" class="wp-caption aligncenter"><img aria-describedby="caption-attachment-1126" data-attachment-id="1126" data-permalink="https://allthingsaafs.com/2015/01/25/3-million-year-old-fossilised-metacarpals-show-evidence-of-tool-use/australopithecus-skull/#main" data-orig-file="https://allthingsaafs.com/wp-content/uploads/2015/01/australopithecus-skull.jpg" data-orig-size="990,686" data-comments-opened="1" data-image-meta="{"aperture":"0","credit":"","camera":"","caption":"","created_timestamp":"0","copyright":"","focal_length":"0","iso":"0","shutter_speed":"0","title":"","orientation":"0"}" data-image-title="australopithecus skull" data-image-description="" data-image-caption="<p>Figure 1: A recent study has put forward some important evidence of early human ancestors, in particular Australopithecus africanus (pictured), wielding tools in a human like fashion dating around 3 to 2-million years ago. </p> " data-medium-file="https://allthingsaafs.com/wp-content/uploads/2015/01/australopithecus-skull.jpg?w=300" data-large-file="https://allthingsaafs.com/wp-content/uploads/2015/01/australopithecus-skull.jpg?w=660" class="wp-image-1126" src="https://allthingsaafs.com/wp-content/uploads/2015/01/australopithecus-skull.jpg?w=499&h=346" alt="Figure 1: A recent study has put forward some important evidence of early human ancestors, in particular Australopithecus africanus (pictured), wielding tools in a human like fashion dating around 3 to 2-million years ago. " width="499" height="346" srcset="https://allthingsaafs.com/wp-content/uploads/2015/01/australopithecus-skull.jpg?w=300 300w, https://allthingsaafs.com/wp-content/uploads/2015/01/australopithecus-skull.jpg?w=499 499w, https://allthingsaafs.com/wp-content/uploads/2015/01/australopithecus-skull.jpg?w=150 150w, https://allthingsaafs.com/wp-content/uploads/2015/01/australopithecus-skull.jpg?w=768 768w, https://allthingsaafs.com/wp-content/uploads/2015/01/australopithecus-skull.jpg 990w" sizes="(max-width: 499px) 100vw, 499px" /><p id="caption-attachment-1126" class="wp-caption-text">Figure 1: A recent study has put forward some important evidence of early human ancestors, in particular <em>Australopithecus africanus</em> (pictured), wielding tools in a human like fashion dating around 3 to 2-million years ago . ©Shaen Adey, Gallo Images/Corbis.</p></div> <p>The study, led by Matthew Skinner from the University of Kent, compared the internal structures of the hand bones from the <em>Australopithecus africanus</em> and several Pleistocene hominins, which were previously considered to have not engaged in habitual tool use.</p> <p>Skinner <em>et al,</em> found that they all have a human trabecular (spongy) bone pattern in the metacarpals, and this is consistent with the “forceful opposition of the thumb and fingers typically adopted during tool use”.</p> <div data-shortcode="caption" id="attachment_1127" style="width: 510px" class="wp-caption aligncenter"><img aria-describedby="caption-attachment-1127" data-attachment-id="1127" data-permalink="https://allthingsaafs.com/2015/01/25/3-million-year-old-fossilised-metacarpals-show-evidence-of-tool-use/metacarpals-ancestors-tool-use/#main" data-orig-file="https://allthingsaafs.com/wp-content/uploads/2015/01/metacarpals-ancestors-tool-use.jpg" data-orig-size="750,743" data-comments-opened="1" data-image-meta="{"aperture":"0","credit":"","camera":"","caption":"","created_timestamp":"0","copyright":"","focal_length":"0","iso":"0","shutter_speed":"0","title":"","orientation":"0"}" data-image-title="metacarpals – ancestors tool use" data-image-description="" data-image-caption="<p>Top row: First metacarpals of the various hominins.<br /> Bottom row: 3-D renderings from the micro-CT scans showing a cross-section of the bone structure inside.</p> " data-medium-file="https://allthingsaafs.com/wp-content/uploads/2015/01/metacarpals-ancestors-tool-use.jpg?w=300" data-large-file="https://allthingsaafs.com/wp-content/uploads/2015/01/metacarpals-ancestors-tool-use.jpg?w=660" loading="lazy" class="wp-image-1127" src="https://allthingsaafs.com/wp-content/uploads/2015/01/metacarpals-ancestors-tool-use.jpg?w=500&h=495" alt="Top row: First metacarpals of the various hominins. Bottom row: 3-D renderings from the micro-CT scans showing a cross-section of the bone structure inside." width="500" height="495" srcset="https://allthingsaafs.com/wp-content/uploads/2015/01/metacarpals-ancestors-tool-use.jpg?w=500 500w, https://allthingsaafs.com/wp-content/uploads/2015/01/metacarpals-ancestors-tool-use.jpg?w=150 150w, https://allthingsaafs.com/wp-content/uploads/2015/01/metacarpals-ancestors-tool-use.jpg?w=300 300w, https://allthingsaafs.com/wp-content/uploads/2015/01/metacarpals-ancestors-tool-use.jpg 750w" sizes="(max-width: 500px) 100vw, 500px" /><p id="caption-attachment-1127" class="wp-caption-text">Figure 2: Top row: First metacarpals of the various hominids.<br /> Bottom row: 3-D renderings from the micro-CT scans showing a cross-section of the bone structure inside. ©T.L. Kivell</p></div> <p>The evolution of the hand, mainly the development of opposable thumbs, has been hailed as the key to success for early humans. It is thought that without the improvement of our grip and hand posture, tool technology could not have emerged and developed as well as it has.</p> <p>This piece of research will provide a new discussion into when the first appearance of habitual tool use occurred in prehistory, as this study’s evidence of modern human-like tool use is dated 0.5-million years earlier than the first archaeological evidence of stone tools.</p> <p><strong>References:</strong></p> <p>Skinner, M. Stephens, N. Tsegai, Z. Foote, A. Nguyen, N. Gross, T. Pahr, D. Hublin, J. Kivell, T. 2015. Human-like hand use in <em>Australopithecus africanus</em>. <em style="font-weight:inherit;">Science.</em> 347, 6220. p395-399.<br /> <strong>You can view this paper by clicking <a href="http://www.sciencemag.org/content/347/6220/395">here.</a></strong></p> <p> </p> <p><strong><em>If you’re a student – check out our <a href="https://allthingsaafs.com/category/quick-tips/" target="_blank">‘Quick Tips’</a> posts where we breakdown topics of AAFS into bite-sized chunks. 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href="https://allthingsaafs.com/2013/07/16/why-is-the-mating-between-the-closely-genetically-related-chimpanzees-pan-troglodytes-and-bonobos-pan-paniscus-so-different/" title="12:10 am" rel="bookmark"><time class="entry-date" datetime="2013-07-16T00:10:41+01:00" pubdate>16/07/2013</time></a><span class="byline"> by <span class="author vcard"><a class="url fn n" href="https://allthingsaafs.com/author/rosemaryhelenmayne/" title="View all posts by All Things AAFS!" rel="author">All Things AAFS!</a></span></span> </div> <h1 class="entry-title"><a href="https://allthingsaafs.com/2013/07/16/why-is-the-mating-between-the-closely-genetically-related-chimpanzees-pan-troglodytes-and-bonobos-pan-paniscus-so-different/" rel="bookmark">Why is the mating between the closely genetically related Chimpanzees (Pan troglodytes) and Bonobos (Pan paniscus) so different?</a></h1> </header> <div class="entry-content"> <p style="text-align:left;" align="center"><em>Taken from an assignment in which I was set the task to combat a controversial question <em>and then create a conference paper on the topic </em>for a Primate Behavioural Ecology unit. This is a comparative approach of factors that could attribute to the differences, and not a definitive answer – just my analysis of theories/my own conclusion.</em><b><br /> </b></p> <p><strong>Abstract:</strong></p> <p>Primates, <i>Pan troglodytes </i>and <i>Pan paniscus, both </i>speciated from a shared last common ancestor, yet they have very different mating behaviours. <i>Pan troglodytes</i> are known for their aggressive behaviour, even when it comes to mating. <i>Pan paniscus</i> on the other hand are known to perform sexual activities for purposes other than reproduction. There are many social, physiological and environmental factors which could have caused this diverse approach to reproduction. Within this paper I will be utilising past research, conducted on these contributing factors, to theorise why these primates have created two different behaviours types when they are so close genetically.</p> <p><strong>Introduction</strong></p> <p>Chimpanzees (<i>Pan troglodytes) </i>and Bonobos (<i>Pan paniscus) </i>speciated from their last common ancestor and share similar genetic information (Ruvolo <i>et al, </i>1994). Both <i>Pan paniscus </i>and <i>Pan troglodytes</i> habit Africa, where they are separated by the River Congo.<i> Pan troglodytes </i>commonly habit the west and central parts of Africa whereas the <i>Pan paniscus</i> habit the Democratic Republic of the Congo. Due to this separation it would seem that genetics have no vital role in the different mating styles, but the environment and social interactions do. To understand the behaviours of adult <i>Pan troglodytes </i>and <i>Pan paniscus </i>we need to understand their anatomy when it comes to mating.</p> <p>Within the lifespan of <i>Pan paniscus </i>and <i>Pan troglodytes</i> they encounter many physiological changes, some of which are adaptive to their environments. Male <i>Pan troglodytes </i>reach maturity between the ages of nine and sixteen, and male <i>Pan paniscus</i> reach maturity around the age of nine. Female <i>Pan troglodytes </i>have their first estrus around the age of ten, which is characterised by the sex skin swelling. <i>Pan paniscus </i>have their first estrus before their menarche. Menarche, their first ovulatory cycle, occurs between six and eleven years old whereas for <i>P. troglodytes </i>it occurs after the first estrus (Cawthon-Lang, 2010). As we can see there are certain similarities, such as the male maturity age, within both primates biological development, but as with menarche there are differences. So does this influence their mating behaviours?</p> <p><strong>Mating Behaviours</strong></p> <p>Both <i>Pan troglodytes</i> and <i>Pan paniscus</i> have been observed to practice opportunistic (multiple) mating (Cawthon-Lang, 2010). Multiple mating, also known as promiscuous mating is where a female will mate with numerous males within the population. Throughout the animal kingdom there are many benefits of practicing opportunistic mating; increase genetic diversity, avoid infanticide, exchange resources, increase possibility of fertilisation and avoiding male harassment, compared to their costs: male retaliation, male aggression, and energy/time. There are numerous benefits for practicing multiple mating within a group of primates compared to the few costs. It must be noted that from multiple mating, female <i>Pan troglodytes </i>do not receive<i> </i>resources but receive decreased levels of male aggression and the choice of better males (Matsumoto-Oda, 1999). A key aspect of participating in multiple mating is ‘female choice’. The female can time which males she mates with in relation to her current ovulation state. When she feels she is at most fertile, she could choose to mate with more successful males within the group and when she isn’t at her most fertile mate with the lower ranking males (Matsumoto-Oda, 1999).</p> <p><i>Pan troglodytes </i>have also been observed practicing possessive and consort-ship mating (Cawthon-Lang, 2010). Possessive (restrictive) mating is when a male forms a short-term exclusive relationship with a female within a group, and consort-ship is when a female and male create a mutually exclusive relationship isolated from the group. It is thought that males make the choice to have a restrictive mating relationship while for consort-ship it is a mutual choice, as female co-operation is very important for this relationship to be established (Matsumoto-Oda, 1999).</p> <p>There are many factors to consider when comparing the mating behaviours of these two primates. The main factor which has heavy influence on the sexual behaviour of are sociological. Sociological factors include gender dominance, philopatry, community type, and infanticide. Environmental factors such as predation and food abundance, play a minor part.</p> <p><strong>Influencing Factors</strong></p> <p><strong></strong><i>Pan troglodytes</i> and <i>Pan paniscus</i> have some shared sociological factors such as both communities are of a fission-fusion social structure and that both are male-philopatric (Cawthon-Lang, 2010). A fission-fusion social group is where a large community is made up of temporary smaller sub groups and the population of the sub groups change due to movement between the subgroups. Smaller groups of <i>Pan troglodytes</i> can be made up of eight to ten members whereas larger groups could reach forty. An influencing factor on group size is food abundance; if there are a lot of resources a group will become larger, due to migration from smaller groups, to exploit the high supply of food (Boesch, 1996).</p> <p>This fission-fusion social group system plays a vital role in the male-philopatric nature of these species. Male-philopatry is where the females leave their natal subgroups and migrate to another subgroup once reaching sexual maturity (Cawthon-Lang, 2010). This practice helps create better gene diversity within a population as there is less chance of inbreeding due to the males within the new subgroup usually not being related to the emigrated female (Inoue<em> et al</em>, 2008). During this migratory process the females have adolescent infertility which lasts from one to two years for <i>P. paniscus</i> and then two to four years for<i> P. troglodytes. </i>This is hypothesised to be an adaption to protect the female. For example, if a female arrived at a new subgroup with an infant or pregnant there could be violence and aggression towards them (Cawthon-Lang, 2010).</p> <p>A big difference between <i>Pan troglodytes</i> and <i>Pan paniscus</i> is the dominate gender, with <i>P. paniscus</i> it is the females who are dominant, with <i>P. troglodytes</i> it is the males. Female <i>Pan paniscus</i> obtain rank as they age and have offspring, especially males. Their sons often have corroborating rank as they mature and as the adult female becomes more central to the group (Surbeck et al, 2010).</p> <p>There are a few unique behaviours and social practices to both species. There are two behavioural practices within P. paniscus, which stems from the female dominance, which are the use of sex for communication and sex between females. Same-sex behaviour between dyads occurs in both wild and captive bonobos. The use of these behaviours has been theorised for the use of practice, paternity confusion, exchange, communication and appeasement (Mason et al, 1996). It is thought that the effective female-female coalitions against males within a population of <i>Pan paniscus</i> is facilitated by the same sex behaviours.</p> <p>Wrangham (1993) identified five functional categories of sexual behaviour within a <i>Pan paniscus</i> population; conception, practice, paternity confusion, exchange and communication. The function of practicing sex, paternity confusion and an exchange of behaviours is also used within populations of <i>Pan troglodytes. </i>Practice by juvenile Bonobos may be vital for developing effective courtship and copulatory techniques. The paternity confusion aspect applies to situations in which adult males could become a threat to infants which are not their own. Use of sexual behaviour for exchanging of resources or benefits such as food or grooming. From the communication function, sex between dyads can be used for appeasement without affecting their relationship and to communicate about their social relationship (Mason <em>et al</em>, 1996).</p> <p>A unique practice to <i>P. troglodytes</i> is infanticide. Infanticide has been documented at Gombe, Mahla and Kibale within the chimpanzee study sites and this practice has been often attributed to sexual selection theory. Male <i>P. troglodytes</i> are more likely to exhibit infanticidal behaviour, mainly killing infants that are unlikely to be theirs. Also the act of infanticide shortens the inter-birth intervals as it induces cycling in the females that have lost their offspring (Cawthon-Lang, 2010). Therefore the use of infanticide can increase a male’s chance of producing offspring. It is hypothesised that this is due to the link between suckling and amenorrhea (Fedigan and Rose, 1995). There has been documentation of females committing infanticide, but there is some question whether these were isolated incidences or could be related to dominance rank in females (Pusey <em>et al</em>, 1997). There hasn’t been any documentation of infanticide within a population of <i>Pan paniscus</i> which could be either assessed as the use of non-conceptual sexual behaviour causing paternity confusion, or that there just hasn’t been any witnessed accounts.</p> <p><strong> Conclusion</strong></p> <p>The fact that <i>Pan paniscus </i>and <i>Pan troglodytes</i> share many social factors, such as fission-fusion social group structure and are both male-philopatric, shows that these factors in no way affect the aggressiveness of mating within the species. The main factors to contribute to this stark difference are the unique practices, such as sexual contact as communication for <i>Pan paniscus</i> and male dominance for <i>Pan troglodytes</i>, they have adopted into their communities.</p> <p>The use of sexual behaviour within a <i>Pan paniscus</i> population to diffuse situations and establish relationship hierarchy has meant that most conflicts are resolved somewhat peacefully through sexual activity. Within a population of <i>Pan troglodytes</i> most conflicts are resolved by a fight or aggressive display.</p> <p>There is a hypothesis that the adaption of violence is all down to <i>Pan troglodytes</i> habitat during the earlier eras. Earlier chimpanzees occupied a small compact area below the river, now known as the Democratic Republic of the Congo, isolated with no predators and an abundance of food. Whereas Chimpanzees above the river<i> </i>had to habit this area with a population of Gorillas. This caused a high demand for food, as both <i>Pan troglodytes</i> and Gorillas share the same diet which caused competition for food sources (Wrangham and Parish, 2001). This is used to explain why chimpanzees have adapted to use violence to solve conflicts. There isn’t much supporting evidence for this ‘evolved to utilise violence’ approach but gives an interesting look into how environmental factors could have played a much bigger part in the moulding of <i>Pan troglodytes</i> aggressive behaviour.</p> <p>It is more creditable to acknowledge that the communication within the <i>Pan paniscus</i> is a lot clearer, with resolutions met instead of an escalation of violence, which has a higher influence on the peaceful aspect of their society. This peaceful aspect along with the fact females entice the males into sexual activity, instead of the chimpanzee males soliciting sex, creates a mutual beneficial mating style.</p> <p><i></i><strong>References:</strong></p> <p>Boesch C. 1996. Social grouping in Taï chimpanzees. <i>Great ape societies</i>. Cambridge, England: Cambridge Univ Pr; p 101-13.</p> <p>Cawthon Lang, K. 2010. Primate Factsheets: Bonobo (<i>Pan paniscus</i>) Behavior . <i>National Primate Research Centre.</i></p> <p>Fedigan, L. Rose, L. 1995. Interbirth interval variation in three sympatric species of neotropical monkey. <i>American Journal of Primatology</i>. Volume 37 (1), 9-24.</p> <p>Inoue, E. Inoue-Murayama, M. Vigilant, L. Takenaka, O. Nishida, T. Relatedness in Wild Chimpanzees; Influence of Paternity, Male Philopatry and Demographic Factors. <i>American Journal of Physical Anthropology. </i>Volume 137 (1), 256-262.</p> <p>Manson, J. Perry, S. Parish, A. 1996. Nonconceptive sexual behaviour in bonobos and capuchins. <i>International Journal of Primatology. </i>Volume 18 (5), 767-785.</p> <p>Matsumoto-Oda, A. 1999. Female choice in the opportunistic mating of wild Chimpanzees at Mahale. <i>Behav Ecol Sociobiol. </i>Volume 46 (1), 258-266.</p> <p>Pusey, AE, Williams, J, Goodall, J. 1997. The influence of dominance rank on the reproductive success of female chimpanzees. <i>Science. </i>Volume <i> </i>277(5327), 828-831.</p> <p>Ruvolo, M. Pan, D. Zehr, S. Goldberg, T. Disotell, T. 1994. Gene trees and hominoid phylogeny. Proceedings of the National Academy of Sciences of the U.S.A. Volume 91 (1), 8900-8904.</p> <p>Surbeck, M. Mundry, R. Hohmann, G. 2010. Mothers matter! Maternal support, dominance status and mating success in male bonobos ( <i>Pan paniscus )</i>. <i>Proceedings of the Royal Society Biological Sciences. </i>Volume 278 (1), 590-598.<i> </i></p> <p>Wrangham, R. 1993. 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