It’s Official: Three-Toed Sloths Are the Slowest Mammals on Earth

After seven years of studying three-toed sloths, scientists at the University of Wisconsin–Madison have made it official: the tree-dwelling animals are the slowest mammals on earth, metabolically speaking.

With a metabolic rate of 162 kilojoules per day per kilogram, the three-toed sloths have lower energy needs than koalas, which require 410 kilojoules per day per kilogram.



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