Editing Cetacea (section)

=== Senses ===
====Vision====
{{see also|Monochromacy}}
Cetacean eyes are set on the sides rather than the front of the head. This means only species with pointed 'beaks' (such as dolphins) have good [[binocular vision]] forward and downward. [[Lacrimal gland|Tear glands]] secrete greasy tears, which protect the eyes from the salt in the water. The lens is almost spherical, which is most efficient at focusing the minimal light that reaches deep water.{{citation needed|date=February 2025}}{{clarify|the shape is necessary for focusing in water and has little to do with light levels. monochromacy is because the light is monochrome blue at depth|date=February 2025}}

====Chemical senses====
Odontocetes have little to no ability to taste or smell, while mysticetes are believed to have some ability to smell because of their reduced, but functional [[olfactory system]].<ref>{{Cite journal|last1=Godfrey|first1=Stephen J.|last2=Geisler|first2=Jonathan|last3=Fitzgerald|first3=Erich M. G.|date=2013|title=On the Olfactory Anatomy in an Archaic Whale (Protocetidae, Cetacea) and the Minke Whale Balaenoptera acutorostrata (Balaenopteridae, Cetacea)|journal=The Anatomical Record|language=en|volume=296|issue=2|pages=257–272|doi=10.1002/ar.22637|pmid=23233318|s2cid=25260840|issn=1932-8494|doi-access=free}}</ref>

====Electroreception====
At least one species, the [[tucuxi]] or Guiana dolphin, is able to use [[electroreception]] to sense prey.<ref name=":0">{{cite web |last=Morell |first=Virginia |title=Guiana Dolphins Can Use Electric Signals to Locate Prey |work=Science |publisher=American Association for the Advancement of Science (AAAS) |date=July 2011 |url=http://news.sciencemag.org/sciencenow/2011/07/guiana-dolphins-can-use-electric.html?ref=hp |url-status=dead |archive-url=https://web.archive.org/web/20130530040210/http://news.sciencemag.org/sciencenow/2011/07/guiana-dolphins-can-use-electric.html?ref=hp |archive-date=2013-05-30 }}</ref>