When it comes to saving energy, three-toed sloths are on a league of their own—panda bears, koalas and opossums can’t beat them—according to a research paper by Jonathan Pauli and Zachariah Peery, of the University of Wisconsin–Madison. “We really expected them to have low metabolic rates, but we found them to have tremendously low energy needs—much lower than their cousins, the two-toed sloths, and the lowest documented for any mammal,” Pauli says.
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