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Small warm-blooded animals have insulation in the form of fur or feathers. Aquatic warm-blooded animals, such as seals, generally have deep layers of blubber under the skin and any pelage (fur) that they might have; both contribute to their insulation. Penguins have both feathers and blubber. Penguin feathers are scale-like and serve both for ...
Nearly all mammals are endothermic ("warm-blooded"). Most mammals also have hair to help keep them warm. Like birds, mammals can forage or hunt in weather and climates too cold for ectothermic ("cold-blooded") reptiles and insects. Endothermy requires plenty of food energy, so mammals eat more food per unit of body weight than most reptiles. [141]
Warm-blooded is an informal term referring to animal species whose bodies maintain a temperature higher than that of their environment. In particular, homeothermic species (including birds and mammals ) maintain a stable body temperature by regulating metabolic processes.
The cynodonts probably had some form of warm-blooded metabolism. This has led to many reconstructions of cynodonts as having fur . Being endothermic they may have needed it for thermoregulation , but fossil evidence of their fur (or lack thereof) has been elusive.
More primitive members of the Cynodontia are also hypothesized to have had fur or a fur-like covering based on their inferred warm-blooded metabolism. [40] While more direct evidence of fur in early cynodonts has been proposed in the form of small pits on the snout possibly associated with whiskers , such pits are also found in some reptiles ...
Dinosaurs were initially cold-blooded, but global warming 180 million years ago may have triggered the evolution of warm-blooded species, a new study found.
The body and the broad, flat tail of the platypus are covered with dense, brown, biofluorescent fur that traps a layer of insulating air to keep the animal warm. [21] [26] [33] The fur is waterproof, and textured like that of a mole. [34] The platypus's tail stores fat reserves, an adaptation also found in the Tasmanian devil. [35]
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