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searchaux" style="display:none">Sensory abilities in snakes</div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:The_Pit_Organs_of_Two_Different_Snakes.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/4/47/The_Pit_Organs_of_Two_Different_Snakes.jpg/220px-The_Pit_Organs_of_Two_Different_Snakes.jpg" decoding="async" width="220" height="291" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/47/The_Pit_Organs_of_Two_Different_Snakes.jpg/330px-The_Pit_Organs_of_Two_Different_Snakes.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/47/The_Pit_Organs_of_Two_Different_Snakes.jpg/440px-The_Pit_Organs_of_Two_Different_Snakes.jpg 2x" data-file-width="500" data-file-height="661" /></a><figcaption>A python (top) and rattlesnake illustrating the positions of the pit organs. Arrows pointing to the pit organs are red; a black arrow points to the nostril.</figcaption></figure> <p>The ability to sense <a href="/wiki/Infrared" title="Infrared">infrared</a> <a href="/wiki/Thermal_radiation" title="Thermal radiation">thermal radiation</a> evolved independently in three different groups of snakes, consisting of the families of <a href="/wiki/Boidae" title="Boidae">Boidae</a> (boas), <a href="/wiki/Pythonidae" title="Pythonidae">Pythonidae</a> (pythons), and the subfamily <a href="/wiki/Crotalinae" class="mw-redirect" title="Crotalinae">Crotalinae</a> (pit vipers). What is commonly called a <b>pit organ</b> allows these animals to essentially "see"<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> radiant heat at <a href="/wiki/Wavelength" title="Wavelength">wavelengths</a> between 5 and 30 <a href="/wiki/Micrometre" title="Micrometre">μm</a>. The more advanced infrared sense of pit vipers allows these animals to strike prey accurately even in the absence of light, and detect warm objects from several meters away.<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> It was previously thought that the organs evolved primarily as prey detectors, but recent evidence suggests that it may also be used in <a href="/wiki/Thermoregulation" title="Thermoregulation">thermoregulation</a> and <a href="/wiki/Predator" class="mw-redirect" title="Predator">predator</a> detection, making it a more general-purpose sensory organ than was supposed.<sup id="cite_ref-KBLaD_4-0" class="reference"><a href="#cite_note-KBLaD-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Gre92_5-0" class="reference"><a href="#cite_note-Gre92-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Phylogeny_and_evolution">Phylogeny and evolution</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Infrared_sensing_in_snakes&action=edit&section=1" title="Edit section: Phylogeny and evolution"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The facial pit underwent <a href="/wiki/Parallel_evolution" title="Parallel evolution">parallel evolution</a> in <a href="/wiki/Crotalinae" class="mw-redirect" title="Crotalinae">pitvipers</a> and some <a href="/wiki/Boidae" title="Boidae">boas</a> and <a href="/wiki/Pythonidae" title="Pythonidae">pythons</a>. It evolved once in pitvipers and multiple times in boas and pythons.<sup id="cite_ref-Pou92_6-0" class="reference"><a href="#cite_note-Pou92-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> The <a href="/wiki/Electrophysiology" title="Electrophysiology">electrophysiology</a> of the structure is similar between the two lineages, but they differ in gross structural <a href="/wiki/Anatomy" title="Anatomy">anatomy</a>. Most superficially, pitvipers possess one large pit organ on either side of the head, between the eye and the nostril (<a href="/wiki/Loreal_pit" title="Loreal pit">loreal pits</a>), while boas and pythons have three or more smaller pits lining the upper and sometimes the lower lip, in or between the scales (labial pits). Those of the pitvipers are the more advanced, having a suspended sensory membrane as opposed to a simple pit structure. </p> <div class="mw-heading mw-heading2"><h2 id="Anatomy">Anatomy</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Infrared_sensing_in_snakes&action=edit&section=2" title="Edit section: Anatomy"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div><p> In <a href="/wiki/Crotalinae" class="mw-redirect" title="Crotalinae">pit vipers</a>, the heat pit consists of a deep pocket in the rostrum with a <a href="/wiki/Biological_membrane" title="Biological membrane">membrane</a> stretched across it. Behind the membrane, an air-filled chamber provides air contact on either side of the membrane. The pit membrane is highly vascular and heavily innervated with numerous heat-sensitive receptors formed from terminal masses of the <a href="/wiki/Trigeminal_nerve" title="Trigeminal nerve">trigeminal nerve</a> (terminal nerve masses, or TNMs). The receptors are therefore not discrete cells, but a part of the trigeminal nerve itself. The labial pit found in <a href="/wiki/Boidae" title="Boidae">boas</a> and <a href="/wiki/Pythonidae" title="Pythonidae">pythons</a> lacks the suspended membrane and consists more simply of a pit lined with a membrane that is similarly innervated and vascular, though the morphology of the <a href="/wiki/Vasculature" class="mw-redirect" title="Vasculature">vasculature</a> differs between these snakes and <a href="/wiki/Crotalinae" class="mw-redirect" title="Crotalinae">crotalines</a>. The purpose of the vasculature, in addition to providing oxygen to the receptor terminals, is to rapidly cool the receptors to their thermo-neutral state after being heated by thermal radiation from a stimulus. Were it not for this vasculature, the receptor would remain in a warm state after being exposed to a warm stimulus, and would present the animal with afterimages even after the stimulus was removed.<sup id="cite_ref-Gor03_7-0" class="reference"><a href="#cite_note-Gor03-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> </p><figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Diagram_of_the_Crotaline_Pit_Organ.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/b/bf/Diagram_of_the_Crotaline_Pit_Organ.jpg/220px-Diagram_of_the_Crotaline_Pit_Organ.jpg" decoding="async" width="220" height="226" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/bf/Diagram_of_the_Crotaline_Pit_Organ.jpg/330px-Diagram_of_the_Crotaline_Pit_Organ.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/b/bf/Diagram_of_the_Crotaline_Pit_Organ.jpg 2x" data-file-width="365" data-file-height="375" /></a><figcaption>Diagram of the Crotaline pit organ.</figcaption></figure> <div class="mw-heading mw-heading3"><h3 id="Neuroanatomy">Neuroanatomy</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Infrared_sensing_in_snakes&action=edit&section=3" title="Edit section: Neuroanatomy"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>In all cases, the facial pit is innervated by the trigeminal nerve. In <a href="/wiki/Crotalinae" class="mw-redirect" title="Crotalinae">crotalines</a>, information from the pit organ is relayed to the nucleus reticularus caloris in the <a href="/wiki/Medulla_oblongata" title="Medulla oblongata">medulla</a> via the lateral descending trigeminal tract. From there, it is relayed to the contralateral <a href="/wiki/Optic_tectum" class="mw-redirect" title="Optic tectum">optic tectum</a>. In <a href="/wiki/Boidae" title="Boidae">boas</a> and <a href="/wiki/Pythonidae" title="Pythonidae">pythons</a>, information from the labial pit is sent directly to the contralateral optic tectum via the lateral descending trigeminal tract, bypassing the nucleus reticularus caloris.<sup id="cite_ref-New80_8-0" class="reference"><a href="#cite_note-New80-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> </p><p>It is the optic tectum of the brain which eventually processes these infrared cues. This portion of the brain receives other sensory information as well, most notably <a href="/wiki/Optic" class="mw-redirect" title="Optic">optic</a> stimulation, but also motor, <a href="/wiki/Proprioceptive" class="mw-redirect" title="Proprioceptive">proprioceptive</a> and <a href="/wiki/Sound" title="Sound">auditory</a>. Some <a href="/wiki/Neurons" class="mw-redirect" title="Neurons">neurons</a> in the tectum respond to visual or infrared stimulation alone; others respond more strongly to combined visual and infrared stimulation, and still others respond only to a combination of visual and infrared. Some neurons appear to be tuned to detect movement in one direction. It has been found that the snake's visual and infrared maps of the world are overlaid in the optic tectum. This combined information is relayed via the tectum to the forebrain.<sup id="cite_ref-Har78_9-0" class="reference"><a href="#cite_note-Har78-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> </p><p>The nerve fibers in the pit organ are constantly firing at a very low rate. Objects that are within a neutral temperature range do not change the rate of firing; the neutral range is determined by the average thermal radiation of all objects in the <a href="/wiki/Receptive_field" title="Receptive field">receptive field</a> of the organ. The thermal radiation above a given threshold causes an increase in the temperature of the nerve fiber, resulting in stimulation of the nerve and subsequent firing, with increased temperature resulting in increased firing rate.<sup id="cite_ref-Bul52_10-0" class="reference"><a href="#cite_note-Bul52-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> The sensitivity of the nerve fibers is estimated to be <0.001 °C.<sup id="cite_ref-Bak07_11-0" class="reference"><a href="#cite_note-Bak07-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup> </p><p>The pit organ will adapt to a repeated stimulus; if an adapted stimulus is removed, there will be a fluctuation in the opposite direction. For example, if a warm object is placed in front of the snake, the organ will increase in firing rate at first, but after a while will adapt to the warm object and the firing rate of the nerves in the pit organ will return to normal. If that warm object is then removed, the pit organ will now register the space that it used to occupy as being colder, and as such the firing rate will be depressed until it adapts to the removal of the object. The latency period of adaptation is approximately 50 to 150 ms.<sup id="cite_ref-Bul52_10-1" class="reference"><a href="#cite_note-Bul52-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> </p><p>The facial pit actually visualizes thermal radiation using the same optical principles as a <a href="/wiki/Pinhole_camera" title="Pinhole camera">pinhole camera</a>, wherein the location of a source of thermal radiation is determined by the location of the radiation on the membrane of the heat pit. However, studies that have visualized the thermal images seen by the facial pit using computer analysis have suggested that the resolution is extremely poor. The size of the opening of the pit results in poor resolution of small, warm objects, and coupled with the pit's small size and subsequent poor <a href="/wiki/Heat_conduction" class="mw-redirect" title="Heat conduction">heat conduction</a>, the image produced is of extremely low resolution and contrast. It is known that some focusing and sharpening of the image occurs in the lateral descending trigeminal tract, and it is possible that the visual and infrared integration that occurs in the tectum is also used to help sharpen the image. </p> <div class="mw-heading mw-heading3"><h3 id="Molecular_mechanism">Molecular mechanism</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Infrared_sensing_in_snakes&action=edit&section=4" title="Edit section: Molecular mechanism"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>In spite of its detection of infrared light, the infrared detection mechanism is not similar to photoreceptors - while photoreceptors detect light via photochemical reactions, the protein in the pits of snakes is a type of <a href="/wiki/Transient_receptor_potential_channel" title="Transient receptor potential channel">transient receptor potential channel</a>, <a href="/wiki/TRPA1" title="TRPA1">TRPA1</a> which is a temperature sensitive ion channel. It senses infrared signals through a mechanism involving warming of the pit organ, rather than chemical reaction to light.<sup id="cite_ref-Gracheva09_12-0" class="reference"><a href="#cite_note-Gracheva09-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup> In structure and function it resembles a biological version of warmth-sensing instrument called a <a href="/wiki/Bolometer" title="Bolometer">bolometer</a>. This is consistent with the very thin pit membrane, which would allow incoming infrared radiation to quickly and precisely warm a given ion channel and trigger a nerve impulse, as well as the vascularization of the pit membrane in order to rapidly cool the ion channel back to its original temperature state. While the molecular precursors of this mechanism are found in other snakes, the protein is both expressed to a much lower degree and much less sensitive to heat.<sup id="cite_ref-Gracheva09_12-1" class="reference"><a href="#cite_note-Gracheva09-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Behavioral_and_ecological_implications">Behavioral and ecological implications</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Infrared_sensing_in_snakes&action=edit&section=5" title="Edit section: Behavioral and ecological implications"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Infrared sensing snakes use pit organs extensively to detect and target <a href="/wiki/Warm-blooded" title="Warm-blooded">warm-blooded</a> prey such as rodents and birds. Blind or blindfolded rattlesnakes can strike prey accurately in the complete absence of visible light,<sup id="cite_ref-13" class="reference"><a href="#cite_note-13"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-14" class="reference"><a href="#cite_note-14"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup> though it does not appear that they assess prey animals based on their body temperature.<sup id="cite_ref-15" class="reference"><a href="#cite_note-15"><span class="cite-bracket">[</span>15<span class="cite-bracket">]</span></a></sup> In addition, snakes may deliberately choose ambush sites that facilitate infrared detection of prey.<sup id="cite_ref-16" class="reference"><a href="#cite_note-16"><span class="cite-bracket">[</span>16<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-17" class="reference"><a href="#cite_note-17"><span class="cite-bracket">[</span>17<span class="cite-bracket">]</span></a></sup> It was previously assumed that the organ evolved specifically for prey capture.<sup id="cite_ref-Bak07_11-1" class="reference"><a href="#cite_note-Bak07-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup> However, recent evidence suggests that the pit organ is also used for thermoregulation. In an experiment that tested snakes' abilities to locate a cool thermal refuge in an uncomfortably hot maze, all pit vipers were able to locate the refuge quickly and easily, while <a href="/wiki/Viperinae" title="Viperinae">true vipers</a> were unable to do so. This finding suggests that the pit vipers were using their pit organs to aid in thermoregulatory decisions.<sup id="cite_ref-KBLaD_4-1" class="reference"><a href="#cite_note-KBLaD-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> It is also possible that the organ even evolved as a defensive adaptation rather than a predatory one, or that multiple pressures have contributed to the organ's development.<sup id="cite_ref-Gre92_5-1" class="reference"><a href="#cite_note-Gre92-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> The use of the heat pit to direct thermoregulation or other behaviors in pythons and boas has not yet been determined. </p> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Infrared_sensing_in_snakes&action=edit&section=6" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Crotalinae" class="mw-redirect" title="Crotalinae">Crotalinae</a></li> <li><a href="/wiki/Infrared_sensing_in_vampire_bats" title="Infrared sensing in vampire bats">Infrared sensing in vampire bats</a></li> <li><a href="/wiki/Neuroethology" title="Neuroethology">Neuroethology</a></li> <li><a href="/wiki/Thermoception" title="Thermoception">Thermoception</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Infrared_sensing_in_snakes&action=edit&section=7" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist reflist-columns references-column-width" style="column-width: 30em;"> <ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-1">^</a></b></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite id="CITEREFNewmanHartline1981" class="citation journal cs1">Newman, EA; Hartline, PH (1981). <a rel="nofollow" class="external text" href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2693128">"Integration of visual and infrared information in bimodal neurons in the rattlesnake optic tectum"</a>. <i>Science</i>. <b>213</b> (4509): <span class="nowrap">789–</span>91. <a href="/wiki/Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/1981Sci...213..789N">1981Sci...213..789N</a>. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1126%2Fscience.7256281">10.1126/science.7256281</a>. <a href="/wiki/PMC_(identifier)" class="mw-redirect" title="PMC (identifier)">PMC</a> <span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2693128">2693128</a></span>. <a href="/wiki/PMID_(identifier)" class="mw-redirect" title="PMID (identifier)">PMID</a> <a rel="nofollow" class="external text" href="https://pubmed.ncbi.nlm.nih.gov/7256281">7256281</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Science&rft.atitle=Integration+of+visual+and+infrared+information+in+bimodal+neurons+in+the+rattlesnake+optic+tectum&rft.volume=213&rft.issue=4509&rft.pages=%3Cspan+class%3D%22nowrap%22%3E789-%3C%2Fspan%3E91&rft.date=1981&rft_id=https%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fpmc%2Farticles%2FPMC2693128%23id-name%3DPMC&rft_id=info%3Apmid%2F7256281&rft_id=info%3Adoi%2F10.1126%2Fscience.7256281&rft_id=info%3Abibcode%2F1981Sci...213..789N&rft.aulast=Newman&rft.aufirst=EA&rft.au=Hartline%2C+PH&rft_id=https%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fpmc%2Farticles%2FPMC2693128&rfr_id=info%3Asid%2Fen.wikipedia.org%3AInfrared+sensing+in+snakes" class="Z3988"></span></span> </li> <li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite id="CITEREFGorisTerashima1973" class="citation journal cs1">Goris, RC; Terashima, S (1973). 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von Frisch">Karl von Frisch</a></li> <li><a href="/wiki/Erich_von_Holst" title="Erich von Holst">Erich von Holst</a></li> <li><a href="/wiki/J%C3%B6rg-Peter_Ewert" title="Jörg-Peter Ewert">Jörg-Peter Ewert</a></li> <li><a href="/wiki/Franz_Huber" title="Franz Huber">Franz Huber</a></li> <li><a href="/wiki/Bernhard_Hassenstein" title="Bernhard Hassenstein">Bernhard Hassenstein</a></li> <li><a href="/wiki/Werner_E._Reichardt" title="Werner E. Reichardt">Werner E. Reichardt</a></li> <li><a href="/wiki/Eric_Knudsen" title="Eric Knudsen">Eric Knudsen</a></li> <li><a href="/wiki/Eric_Kandel" title="Eric Kandel">Eric Kandel</a></li> <li><a href="/wiki/Nobuo_Suga" title="Nobuo Suga">Nobuo Suga</a></li> <li><a href="/wiki/Masakazu_Konishi" title="Masakazu Konishi">Masakazu Konishi</a></li> <li><a href="/wiki/Fernando_Nottebohm" title="Fernando Nottebohm">Fernando Nottebohm</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Methods</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Patch_clamp" title="Patch clamp">Patch clamp</a></li> <li><a href="/wiki/Slice_preparation" title="Slice preparation">Slice preparation</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Systems</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Animal_echolocation" title="Animal echolocation">Animal echolocation</a></li> <li><a href="/wiki/Waggle_dance" title="Waggle dance">Waggle dance</a></li> <li><a href="/wiki/Jamming_avoidance_response" title="Jamming avoidance response">Jamming avoidance response</a></li> <li><a href="/wiki/Vision_in_toads" title="Vision in toads">Vision in toads</a></li> <li><a href="/wiki/Frog_hearing_and_communication" title="Frog hearing and communication">Frog hearing and communication</a></li> <li><a class="mw-selflink selflink">Infrared sensing in snakes</a></li> <li><a href="/wiki/Caridoid_escape_reaction" title="Caridoid escape reaction">Caridoid escape reaction</a></li> <li><a href="/wiki/Vocal_learning" title="Vocal learning">Vocal learning</a></li> <li><a href="/wiki/Surface_wave_detection" class="mw-redirect" title="Surface wave detection">Surface wave detection</a></li> <li><a href="/wiki/Electroreception" class="mw-redirect" title="Electroreception">Electroreception</a></li> <li><a href="/wiki/Mechanoreception" class="mw-redirect" title="Mechanoreception">Mechanoreception</a> <ul><li><a href="/wiki/Lateral_line" title="Lateral line">Lateral line</a></li></ul></li></ul> </div></td></tr><tr><td class="navbox-abovebelow hlist" colspan="2"><div> <ul><li><span class="noviewer" typeof="mw:File"><span title="Category"><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/16px-Symbol_category_class.svg.png" decoding="async" width="16" height="16" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/23px-Symbol_category_class.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/31px-Symbol_category_class.svg.png 2x" data-file-width="180" data-file-height="185" /></span></span> <b><a href="/wiki/Category:Neuroethology" title="Category:Neuroethology">Category</a></b></li> <li><span class="noviewer" typeof="mw:File"><span title="Commons page"><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/12px-Commons-logo.svg.png" decoding="async" width="12" height="16" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/18px-Commons-logo.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/24px-Commons-logo.svg.png 2x" data-file-width="1024" data-file-height="1376" /></span></span> <b><a href="https://commons.wikimedia.org/wiki/Category:Neuroethology" class="extiw" title="commons:Category:Neuroethology">Commons</a></b></li></ul> </div></td></tr></tbody></table></div> <div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Infrared_sensing_in_snakes&action=edit&section=8" title="Edit section: External links"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a rel="nofollow" class="external text" href="http://www.physorg.com/news76249412.html">Physorg article on Infrared vision in snakes</a></li> <li><a rel="nofollow" class="external text" href="https://web.archive.org/web/20130715070215/http://www.reptileexpert.org/biology/infrared-vision-snakes.php">Infrared vision in snakes summary article (archived 7/15/2013)</a></li></ul>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?useformat=desktop&type=1x1&usesul3=0" alt="" width="1" height="1" style="border: none; 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