Higher body Tps (esp. higher nerve & muscle Tps) allow faster reactions: for every 10°C, the velocity of the biochemical processes is more than doubled. Fast reactions are important for fighting rivals, catching prey, escaping predators, and in birdsfor flying. Generally speaking, the higher the nerve & muscle Tp, the better. But the costs of keeping body tissues at 40°C or more during the day are enormous. The energy expenditure of endotherms is several times that of ectotherms. Probably, Tps >40
Most mammals that heavily rely on speed for survival (e.g. most middle-sized terrestrial mammals) have body Tps of at least 38°C, lower in the morning & after resting, higher in the evening & after exercise, e.g. horses 38°C, cattle & guinea-pigs 38.5, rabbits, sheep & cats 39, goats 39.5°C (Slijper 1958:359). Several small mammals that do not defend themselves by running away may have lower body Tps, e.g. hedgehogs, mole-rats, monotremes, pottos, sloths normally from 30 to 35°C, so they have much
birds for flying. Generally speaking, the higher the nerve & muscle Tp, the better. But the costs of keeping body tissues at 40°C or more during the day are enormous. The energy expenditure of endotherms is several times that of ectotherms. Probably,Higher body Tps (esp. higher nerve & muscle Tps) allow faster reactions: for every 10°C, the velocity of the biochemical processes is more than doubled. Fast reactions are important for fighting rivals, catching prey, escaping predators, and in
38.5, rabbits, sheep & cats 39, goats 39.5°C (Slijper 1958:359). Several small mammals that do not defend themselves by running away may have lower body Tps, e.g. hedgehogs, mole-rats, monotremes, pottos, sloths normally from 30 to 35°C, so they haveMost mammals that heavily rely on speed for survival (e.g. most middle-sized terrestrial mammals) have body Tps of at least 38°C, lower in the morning & after resting, higher in the evening & after exercise, e.g. horses 38°C, cattle & guinea-pigs
Orangutans at rest have the 2nd lowest metabolism amongst arboreal mammals, after sloths. Both have long fur coat at adulthood, neither have much SC fat.
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