In zoology, "'mammalogy "'is the study of mammals a class of vertebrates with characteristics such as homeothermic metabolism, fur, four-chambered hearts, and complex nervous systems.
22.
Any extended ocean voyage without fresh water or food would prove difficult for a large, warm-blooded ( homeothermic ) mammal, but today many small, nocturnal species of lemur exhibit heterothermy, which allows them to lower their metabolism and become dormant while living off fat reserves.
23.
It takes a heckuva lot more heat to overcome the homeothermic mechanisms of a live human being and raise the body temperature from 37 to 38 degrees than it would to raise the temperature of a corpse by 1 degree ( and before you ask, no I have not tested this personally ).
24.
:If you're human, then gills probably will not be sufficient for you to remain underwater & mdash; I believe the oxygen content of water is insufficient to meet a human's needs ( and probably insufficient to meet a homeothermic ( warm-blooded ) mammal's needs in general.
25.
An insulative covering is necessary to keep a homeothermic animal warm if it is very small, less than 5 cm ( 1.97 in ) long; The 3.2 cm ( 1.35 in ) " Hadrocodium " must have had fur, therefore, but the 10 cm ( 3.94 in ) " Morganucodon " might not have needed it.
26.
However, as a homeothermic endotherm it is still faced with the challenge of maintaining a constant body temperature while being exposed to both the day ( light period ) and night ( dark period ) temperatures of its environments . " Phoenicopterus ruber " have evolved a number of thermoregulatory mechanisms to keep itself cool during the light period and warm during the dark period without expending too much energy.
27.
Part of the family Carcharodontosauridae, " Giganotosaurus " is one of the most completely known members of the group, which includes other very large theropods, such as the closely related " Mapusaurus " and " Carcharodontosaurus " . " Giganotosaurus " is thought to have been homeothermic ( a type of " warm-bloodedness " ), with a metabolism between that of a mammal and a reptile, which would have enabled fast growth.
