Editing Warm-blooded (section)

== Varieties of thermoregulation ==
A significant proportion of creatures commonly referred to as "warm-blooded," like birds and mammals, exhibit all three of these categories (i.e., they are endothermic, homeothermic, ''and'' tachymetabolic).  However, over the past three decades, investigations in the field of animal thermophysiology have unveiled numerous species within these two groups that do not meet all these criteria. For instance, many bats and small birds become poikilothermic and bradymetabolic during sleep (or, in nocturnal species, during the day). For such creatures, the term ''[[heterothermy]]'' was introduced.

Further examinations of animals traditionally classified as [[Ectotherm|cold-blooded]] have revealed that most creatures manifest varying combinations of the three aforementioned terms, along with their counterparts (ectothermy, poikilothermy, and bradymetabolism), thus creating a broad spectrum of body temperature types. Some [[fish]] have warm-blooded characteristics, such as the [[opah]]. [[Swordfish]] and some [[shark]]s have [[circulatory system|circulatory]] mechanisms that keep their [[brain]]s and [[eye]]s above ambient temperatures and thus increase their ability to detect and react to [[predation|prey]].<ref>[http://sciencenow.sciencemag.org/cgi/content/full/2005/110/2 Hot Eyes for Cold Fish – Wong 2005 (110): 2 – ScienceNOW]</ref><ref>{{Cite journal| title=Warm brain and eye temperatures in sharks |author1=Block, B.A. |author2=Carey, F.G. |name-list-style=amp | journal=Journal of Comparative Physiology B | volume=156 | issue=2 |date=March 1985 | doi=10.1007/BF00695777 |pmid=3836233 | pages=229–36 |s2cid=33962038 }}</ref><ref>{{Cite web| url=http://www.uq.edu.au/news/?article=6503 | title=Warm eyes give deep-sea predators super vision | publisher=University of Queensland | date=11 January 2005 }}</ref> Tunas and some sharks have similar mechanisms in their muscles, improving their stamina when swimming at high speed.<ref>{{Cite journal | title=Warm-Blooded Fish | author=McFarlane, P. | journal=Monthly Bulletin of the Hamilton and District Aquarium Society | date=January 1999 | url=http://www.aquarticles.com/articles/breeding/McFarlane_Warm_Blooded_Fish.html | access-date=31 May 2008 | archive-url=https://web.archive.org/web/20130515103309/http://www.aquarticles.com/articles/breeding/McFarlane_Warm_Blooded_Fish.html | archive-date=15 May 2013 | url-status=dead }}</ref>