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url('https://becominghuman.org/wp-content/uploads/2023/01/banner-hominim-homo-sapien.jpg'); background-position: center center"> <div class="container"> <div class="container-inner"> <div class="flex-column"> <div class="entry-title"> <h1><em>Homo sapiens</em></h1> </div> </div> </div> </div> </section> <section id="section-link-back" class="breadcrumb"> <div class="container"> <div class="container-inner"> <div class="flex-column"> <a href="https://becominghuman.org/pathways-to-discovery/our-ancestors-hominin-fossil-record/#hominin-groups-filter"><i class="fa fa-long-arrow-left" aria-hidden="true"></i> Discoveries + Evidence of the Past: The Fossil Record</a> </div> </div> </div> </section> <section class="section-main section-single default "> <div class="container"> <div class="container-inner"> <div class="flex-column default left"> <div class="entry-title"> <h3>300,000 to present</h3> </div> <div class="content"> <div id="attachment_2143" style="width: 310px" class="wp-caption alignleft"><img aria-describedby="caption-attachment-2143" fetchpriority="high" decoding="async" class="size-medium wp-image-2143" src="https://becominghuman.org/wp-content/uploads/2023/01/banner-hominim-homo-sapien-300x169.jpg" alt="" width="300" height="169" srcset="https://becominghuman.org/wp-content/uploads/2023/01/banner-hominim-homo-sapien-300x169.jpg 300w, https://becominghuman.org/wp-content/uploads/2023/01/banner-hominim-homo-sapien-1030x579.jpg 1030w, https://becominghuman.org/wp-content/uploads/2023/01/banner-hominim-homo-sapien.jpg 1920w" sizes="(max-width: 300px) 100vw, 300px" /><p id="caption-attachment-2143" class="wp-caption-text">Image credit David L. Brill. <em>From Lucy to Language,</em> Simon & Schuster, 2006</p></div> <p>The latest chapter of human evolution begins with the emergence of our species: <em>Homo sapiens</em>. The anatomy of <em>Homo sapiens</em> is unique among hominin species and appears first in East Africa, dating to roughly more than 200,000 years ago with a possible earlier dispersal around 220,000 years ago. But our species was evolving in Africa during a time of <a href="https://becominghuman.org/pathways-to-discovery/adaptation-to-a-changeable-planet/paleoenvironments/climate-change-and-human-evolution/">dramatic climate change</a> 300,000 years ago.</p> <p><em>H. sapiens</em> unique features—including changes in the skull and postcranial skeleton (skeleton minus skull)—suggest changes in brain size and architecture and an adaptation to tropical environments. These anatomical changes are linked to cognitive and behavioral changes that are equally unique among hominin species. In particular, the archaeological evidence of behaviors thought to be unique to <em>Homo sapiens</em>, which appear first in Africa around 170,000 years ago, highlight the importance of symbolism, complex cognitive behaviors, and a broad subsistence strategy (the strategy used to procure food). The evolution of <em>Homo sapiens</em>is vitally important to defining our species in the broader context of human evolution and is key to understanding the human condition, past and present.</p> <p>Many of the unique features of <em>Homo sapiens</em> are found in the skull. Brain size estimates suggest that the brain of <em>Homo sapiens</em> was larger than in other hominin species. The average cranial capacity of <em>Homo sapiens</em> is roughly 1300 cubic centimeters, making the brains of this species absolutely smaller than those of <a href="https://becominghuman.org/hominin-fossils/homo-neanderthalensis/"><em>Homo neanderthalensis</em>.</a> However, due to its gracile (small and lightly built) postcranial skeleton (see below), the brain of <em>H. sapiens</em> was larger relative to body size than that of <a href="https://becominghuman.org/hominin-fossils/homo-neanderthalensis/"><em>H. neanderthalensis</em>.</a> The skull itself is much taller than earlier hominin species, and the skull is therefore much shorter (from front to back) in relation to its height. The widest point of the <em>Homo sapiens</em> skull is toward the top of the skull and the sides of the skull are nearly vertical. Together with the extreme height of the skull, these features give the <em>Homo sapiens</em> skull a house-shaped (i.e., pentagon with straight walls) appearance when viewed from behind. The skull of <em>Homo sapiens</em> also generally lacks evidence of being strongly built (e.g., it lacks the large brow ridges and bony prominences seen in <a href="https://becominghuman.org/hominin-fossils/homo-neanderthalensis/">H. <em>neanderthalensis</em></a> and <a href="https://becominghuman.org/hominin-fossils/homo-heidelbergensis/"><em>Homo heidelbergensis</em></a>). However, the earliest representatives of the species maintain a fairly rugged appearance. For instance, the brow ridges of early <em>H. sapiens</em> are fairly large but differ in shape from those of <a href="https://becominghuman.org/hominin-fossils/homo-neanderthalensis/"><em>H. neanderthalensis</em> </a>and <a href="https://becominghuman.org/hominin-fossils/homo-heidelbergensis/"><em>H. heidelbergensis</em>.</a> The face of <em>Homo sapiens</em> is much smaller than those of earlier hominin species. In addition, the face is “tucked under” the braincase—i.e., the face is located entirely below (rather than in front of) the front part of the brain. The face of this species also bears a deep indentation (the canine fossa) below each of the orbits. The teeth and mandible (lower jaw) are smaller than in earlier species, and the mandible bears a prominent mental prominence (chin), which is not seen in any other hominin species.</p> <p>Other unique features of the <em>Homo sapiens</em> skeleton are found in the elements below the neck. The postcranial (below the neck) skeleton is very lightly built relative to earlier species and lacks the adaptations to cold environments found in <a href="https://becominghuman.org/hominin-fossils/homo-neanderthalensis/"><em>H. neanderthalensis</em></a>—e.g., thick, shortened limb bones and wide rib cages and hips. These features of the postcranial skeleton are thought to reflect the fact that <em>Homo sapiens</em> evolved in tropical, African environments before migrating across the globe. In these tropical environments, long and lean body proportions were favored because they maximized surface area (and therefore maximizing heat dissipation) while maintaining the same body mass.</p> <p>Perhaps the most intriguing features found in <em>Homo sapiens</em> are behavioral traits. These traits, which can be discerned from the archaeological record, represent behavioral strategies that are not seen in any other hominin species. For instance, <em>Homo sapiens</em> is the first hominin species to hunt a large range of prey animals. Unlike earlier species, <em>Homo sapiens</em> developed more sophisticated and c<a href="https://becominghuman.org/pathways-to-discovery/unique-human-species/cooperation/">ollaborative hunting strategies</a> that allowed them to hunt large, medium, and small mammals, as well as fish and shellfish. The <a href="https://becominghuman.org/pathways-to-discovery/the-fossil-record/archaeology-tools-and-artifacts/middle-stone-age-hominins/">stone tools</a> that were made by <em>Homo sapiens</em> reflect this broader range of prey. In particular, <em>Homo sapiens</em> produced tools that ranged greatly in size and included very small artifacts used for hunting smaller game. The stone tools were also more diverse, reflecting a subsistence strategy that included many different types of animals of varying sizes. In Europe, lithic assemblages (the total sample of lithic artifacts from a particular site) associated with <em>Homo sapiens</em> also include blades (long, narrow artifacts defined as being at least twice as long as they are wide), an artifact rarely seen in lithic assemblages associated with <a href="https://becominghuman.org/hominin-fossils/homo-neanderthalensis/"><em>H. neanderthalensis</em>.</a> In addition, <em>Homo sapiens</em> was the first species to frequently produce tools made from bone and developed new technologies for making composite tools (tools that comprise different parts that are combined to form a tool). <em>Homo sapiens</em> ranged much longer distances to acquire raw materials for making stone tools than earlier species; this is often used as evidence that individual <em>Homo sapiens</em> had much larger ranges than other species. It is important to note that at some sites in western Asia, <em>Homo sapiens</em> are also found associated with tools that are typical of those made by <a href="https://becominghuman.org/hominin-fossils/homo-neanderthalensis/">Neandertals</a> in Europe and in western Asia.</p> <p>Other archaeological evidence strongly suggests that <em>Homo sapiens</em> was the first species to exhibit widespread use of symbolic behavior. For example, early <em>Homo sapiens</em> produced cave art, statues, <a href="https://becominghuman.org/pathways-to-discovery/the-fossil-record/archaeology-tools-and-artifacts/shells-beads-and-ochre/">shell beads, incised ochre, pendants,</a> and figurines. While some researchers contend that these items are also found at some <a href="https://becominghuman.org/hominin-fossils/homo-neanderthalensis/"><em>H. neanderthalensis</em></a> sites, this opinion is contended and, at most, these items are found in much lower abundance at <a href="https://becominghuman.org/hominin-fossils/homo-neanderthalensis/"><em>H. neanderthalensis</em></a> sites. These traits suggest that <em>Homo sapiens</em> had a greater capacity for abstract, symbolic thinking than any earlier species. Based on the anatomy of the upper part of the vertebral column and associated structures, it is also highly likely that <em>Homo sapiens</em> was the first species that was capable of spoken language, but the evidence in support of this claim is scant.</p> <p>The archaeological indicators of the modern behaviors associated with <em>Homo sapiens</em> do not show up at the same time across the range of the species. The first good evidence for these modern behaviors comes from Africa, starting over 150,000 years ago. Different aspects of these behaviors showed up in a piecemeal fashion in Africa between 150,000 and 40,000 years ago, when many of these features show up in concert at African <em>Homo sapiens</em> sites. In Europe, all of these features seem to appear at the same time. This is likely due to the fact that <em>Homo sapiens</em> originated in Africa and did not spread into Europe until almost 100,000 years later. This hypothesis, however, is contended (see below).</p> <p>The evolutionary relationship of <em>Homo sapiens</em> to other earlier and contemporaneous hominins species is very controversial. Most scientists believe that <em>Homo sapiens</em> evolved from populations of <a href="https://becominghuman.org/hominin-fossils/homo-heidelbergensis/"><em>H. heidelbergensis</em></a> in Africa between 150,000 and 200,000 years ago. Following this evolution, <a href="https://becominghuman.org/pathways-to-discovery/the-human-diaspora/emergence-of-modern-humans-in-africa/">the species spread throughout Africa</a>, replacing local populations of <a href="https://becominghuman.org/hominin-fossils/homo-heidelbergensis/"><em>H. heidelbergensis</em>.</a> Around 40,000 to 50,000 years ago, <em>Homo sapiens</em> are thought to have <a href="https://becominghuman.org/pathways-to-discovery/the-human-diaspora/early-migrations/">migrated out of Africa</a> replacing all populations of <a href="https://becominghuman.org/hominin-fossils/homo-neanderthalensis/"><em>H.</em> <em>neanderthalensis</em></a> in Europe and <a href="https://becominghuman.org/hominin-fossils/homo-heidelbergensis/"><em>H. heidelbergensis</em> </a>elsewhere. The evidence for this comes from both the fossil record and from studies of modern DNA. As mentioned above, the earliest undisputed fossil remains of <em>Homo sapiens</em> have been found in Africa, strongly suggesting that it was on this continent that the species first evolved and subsequently spread throughout the world. Adherents to this position (the so-called “Out of Africa/Replacement Model”) generally consider that <em>Homo sapiens</em> and <a href="https://becominghuman.org/hominin-fossils/homo-neanderthalensis/"><em>H. neanderthalensis</em></a> were separate species and that little interbreeding occurred when the species encountered each other in Europe.</p> <p>Historically, some scholars instead supported that <a href="https://becominghuman.org/hominin-fossils/homo-neanderthalensis/"><em>H. neanderthalensis</em></a> is a subspecies of <em>Homo sapiens</em>. According to this viewpoint (the so-called “Multiregional Model”), populations of “archaic” <em>Homo sapiens</em> (including <a href="https://becominghuman.org/hominin-fossils/homo-heidelbergensis/"><em>Homo heidelbergensis</em></a> and <a href="https://becominghuman.org/hominin-fossils/homo-neanderthalensis/"><em>Homo neanderthalensis</em></a>) evolved into <em>Homo sapiens</em> in each region of the Old World. These scientists believed that all archaic populations were connected by gene flow (the sharing of genetic material due to interbreeding) from at least 1.0 million years ago onward. Thus, although interbreeding was more frequent between populations within a region than between them, all of these populations represent a single, evolving species. This situation permitted the evolution of certain regional characteristics that distinguished populations in different regions, while still allowing universally favorable traits to spread across regions by gene flow. Scholars that adhere to this position point to purported anatomical continuity in all of the regions of the world from 1.0 million years ago to the present. For example, these authors claim that traits reminiscent of <a href="https://becominghuman.org/hominin-fossils/homo-neanderthalensis/"><em>H. neanderthalensis</em></a> can be found in modern Europeans. Supporters of this idea believe that interbreeding between <a href="https://becominghuman.org/hominin-fossils/homo-neanderthalensis/"><em>H. neanderthalensis</em></a> and <em>Homo sapiens</em> was more widespread than is traditionally accepted and that <a href="https://becominghuman.org/hominin-fossils/homo-neanderthalensis/"><em>H. neanderthalensis</em> </a>made an important genetic contribution to living <em>Homo sapiens</em>.</p> <p>Recent <a href="https://becominghuman.org/pathways-to-discovery/our-genetic-past-and-future/dna-research/">genetic research</a> demonstrates there could be an intermediate position between these two strongly held ideas. This research, which was the result of the complete sequencing of the <a href="https://becominghuman.org/hominin-fossils/homo-neanderthalensis/"><em>H. neanderthalensis</em> </a>genome, suggests that that interbreeding events between <a href="https://becominghuman.org/hominin-fossils/homo-neanderthalensis/"><em>H. neanderthalensis</em></a> and <em>Homo sapiens</em> were rare, but more common than previously thought. These findings corroborate the ideas espoused by many scientists working in the field that neither of the two traditional models adequately represents the complexity of the interaction between <em>Homo sapiens</em> and <a href="https://becominghuman.org/hominin-fossils/homo-neanderthalensis/"><em>H. neanderthalensis</em>.</a> That is, <a href="https://becominghuman.org/hominin-fossils/homo-neanderthalensis/"><em>H. neanderthalensis</em></a> and <em>Homo sapiens</em> were able to interbreed, but interbreeding was rather rare. Whether the amount of interbreeding constitutes the fact that <a href="https://becominghuman.org/hominin-fossils/homo-neanderthalensis/"><em>H. neanderthalensis</em></a> made an important genetic contribution to living <em>Homo sapiens</em> is, more or less, a semantic matter, depending on how one defines an “important” genetic contribution. In light of this, questions about whether or not <em>Homo sapiens</em> and <a href="https://becominghuman.org/hominin-fossils/homo-neanderthalensis/"><em>H. neanderthalensis</em> </a>are different species or not is rather unimportant as it depends on how one chooses to define species—i.e., by the ability/inability to interbreed or by how evolutionarily distinct these two groups were.</p> <p>What is clear from the European fossil record is the anatomy characteristic of <a href="https://becominghuman.org/hominin-fossils/homo-neanderthalensis/"><em>H. neanderthalensis</em> </a>disappeared rather rapidly between 50,000 and 30,000 years ago and that this disappearance coincides with the migration of <em>Homo sapiens</em> into Europe from Africa. Thus, questions about what exactly caused that disappearance are crucially important and stridently contended. There is no evidence of warfare in Europe (or elsewhere) at this time. Therefore, the notion that <em>Homo sapiens</em> actively exterminated <a href="https://becominghuman.org/hominin-fossils/homo-neanderthalensis/"><em>H. neanderthalensis</em></a> is difficult to maintain. Many scholars believe that the sophisticated symbolic and cognitive capabilities of <em>Homo sapiens</em> combined with their adaptation for hunting a large range of diverse prey allowed them to outcompete <a href="https://becominghuman.org/hominin-fossils/homo-neanderthalensis/"><em>H. neanderthalensis</em>.</a> This point of view is particularly relevant in light of the dramatically shifting climate that was witnessed in Europe around the time that <em>Homo sapiens</em> arrived. That is, <em>Homo sapiens’</em> broad subsistence strategy and ability to cognitively adapt to difficult environments may have allowed them to spread quickly and widely during times when the climate shifted dramatically. <a href="https://becominghuman.org/hominin-fossils/homo-neanderthalensis/"><em>H. neanderthalensis</em>,</a> on the other hand, may have had difficulty dealing with these drastic shifts in climate, due to their focus on hunting large game animals. Other researchers suggest <em>Homo sapiens</em> had a demographic, rather than a technological, edge on <a href="https://becominghuman.org/hominin-fossils/homo-neanderthalensis/"><em>H. neanderthalensis</em>.</a> These scholars suggest <em>Homo sapiens</em> maintained larger and more numerous populations and that, over time, the sheer numbers of <em>Homo sapiens</em> simply swamped out <a href="https://becominghuman.org/hominin-fossils/homo-neanderthalensis/"><em>H. neanderthalensis</em></a> populations, which are thought to be smaller, more spread out, and less numerous. Of course, it is very possible that both of these factors (i.e., technology and demography) acted in concert, resulting in the disappearance of the <a href="https://becominghuman.org/hominin-fossils/homo-neanderthalensis/">Neandertals.</a></p> </div> </div> </div> </div> </section> <section id="section-jump-menu" class=""> <div class="container"> <div class="container-inner"> <div class="flex-column"> <div class="entry-title"> <h2>Jump to Another Section</h2> </div> </div> <div class="flex-column"> <nav class="navigation post-navigation" aria-label="Posts"> <h2 class="screen-reader-text">Post navigation</h2> <div class="nav-links"><div class="nav-previous"><a href="https://becominghuman.org/hominin-fossils/homo-naledi/" rel="prev"><span class="meta-nav">←</span> <em>Homo naledi</em></a></div><div class="nav-next"><a href="https://becominghuman.org/hominin-fossils/homo-floresiensis/" rel="next"><em>Homo floresiensis</em> <span class="meta-nav">→</span></a></div></div> </nav> </div> 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