Why mammals need more energy than other animals?
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Like most other land animals, mammals are ureotelic, and convert ammonia into urea, which is done by the liver as part of the urea cycle. ... reptiles and insects. Endothermy requires plenty of food energy, so mammals eat more food per unit of body weight than most reptiles. Small insectivorous mammals eat prodigious amounts for their size. ... To maintain a high constant body temperature is energy expensive – mammals therefore need a nutritious and plentiful diet.
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