Bigger animals need less food per kilogram

Food needed per kilogram of body weight compared with a human

Megafauna to scale, shaded by food needed per kilogram compared with a human Food needed per kilogram of body weight compared with a human: rat 390%, human 100%, moose 61%, Irish elk 58%, Megatherium 36%, woolly mammoth 33%, Paraceratherium 25%. A mammoth weighs as much as 86 people but eats about as much as 28.

Silhouettes via PhyloPic; Megatherium by Zimices (CC BY-NC 3.0).