Sustained energy output of a<unk>  (a lizard) and a homeotherm (a mouse) as a function of core body temperature. The homeotherm has a much higher output, but can only function over a very narrow range of body temperatures.<unk>  animals must be able to function over a wider range of temperatures than homeotherms. The speed of most chemical reactions vary with temperature, and in order to function<unk> s may have four to ten enzyme systems that operate at different temperatures for an important chemical reaction. As a result,<unk> s often have larger, more complex genomes than homeotherms in the same ecological niche. Frogs are a notable example of this effect, though their complex development is also an important factor in their large genome. Because their metabolism is variable and generally below that of homeothermic animals, sustained high-energy activities like powered flight in large animals or maintaining a large brain is generally beyond<unk>  animals. The metabolism of<unk> s favors strategies such as sit-and-wait hunting over chasing prey for larger animals with high movement cost. As they do not use their metabolisms to heat or cool themselves, total energy requirement over time is low. For the same body weight,<unk> s need only 5 to 10% of the energy of homeotherms.
Poikilotherm
Lightning Strike
Late talker
Stretcher bearer
Digital phobic
Asperger
Mollipect
Bullying