Editing Crocodile (section)

====Touch====
The touch sensors, concentrated in crocodile skin, can be thicker than those in human fingerprints.<ref>{{Cite web|date=9 November 2012|title=Croc Jaws More Sensitive Than Human Fingertips|url=https://www.nationalgeographic.com/animals/article/121108-nile-crocodile-duncan-leitch-science-human-sensitive-touch|archive-url=https://web.archive.org/web/20210325143141/https://www.nationalgeographic.com/animals/article/121108-nile-crocodile-duncan-leitch-science-human-sensitive-touch|url-status=dead|archive-date=25 March 2021|access-date=31 January 2022|website=Animals|language=en}}</ref> Crocodiles can feel the touch on their skin.<ref>{{Cite web|date=14 October 2021|title=Do Crocodiles Feel Pain? (Surprising Answer) {{!}}|url=https://wildexplained.com/do-crocodiles-feel-pain/|access-date=31 January 2022|language=en-us}}</ref>

'''Cranial''': The upper and lower jaws are covered with sensory pits, visible as small, black speckles on the skin, the crocodilian version of the [[lateral line]] organs seen in fish and many amphibians, though arising from a completely different origin. These pigmented nodules encase bundles of [[Axon|nerve fibers]] innervated beneath by branches of the trigeminal nerve. They respond to the slightest disturbance in surface water, detecting vibrations and small pressure changes as small as a single drop.<ref>{{cite news|url=https://www.cbc.ca/news/science/alligators-detect-silent-ripples-when-hunting-1.320458|title=Alligators detect silent ripples when hunting|author=CBCnews|year=2002|access-date=29 April 2013|work=CBC News}}</ref> This makes it possible for crocodiles to detect prey, danger and intruders, even in total darkness. These sense organs are known as domed pressure receptors (DPRs).<ref name="Jackson and Brooks">{{cite journal | last1 = Jackson | first1 = K. | last2 = Brooks | first2 = D.R. | year = 2007 | title = Do crocodiles co-opt their sense of "touch" to "taste"? A possible new type of vertebrate sensory organ | url = http://people.whitman.edu/~jacksok/AMRE2447.pdf | journal = Amphibia-Reptilia | volume = 28 | issue = 2 | pages = 277–285 | doi = 10.1163/156853807780202486 | access-date = 29 April 2013 | archive-url = https://web.archive.org/web/20130730091857/http://people.whitman.edu/~jacksok/AMRE2447.pdf | archive-date = 30 July 2013 | url-status = dead }}</ref>

'''Post-Cranial''': While alligators and caimans have DPRs only on their jaws, crocodiles have similar organs on almost every scale on their bodies. The function of the DPRs on the jaws is clear; to catch prey, but it is still not clear what the function is of the organs on the rest of the body. The receptors flatten when exposed to increased osmotic pressure, such as that experienced when swimming in sea water [[hyperosmotic]] to the body fluids. When contact between the integument and the surrounding sea water solution is blocked, crocodiles are found to lose their ability to discriminate salinities. It has been proposed that the flattening of the sensory organ in hyperosmotic sea water is sensed by the animal as "touch", but interpreted as chemical information about its surroundings.<ref name="Jackson and Brooks" /> This might be why in alligators they are absent on the rest of the body.<ref>{{cite web|url=http://crocodilian.com/cnhc/cbd-gb1.htm |title=Crocodilian Biology Database – Integumentary Sense Organs |publisher=Crocodilian.com |access-date=26 April 2013}}</ref>