pygmy hippopotamus
noun
: a small hippopotamus (Choeropsis liberiensis synonym Hexaprotodon liberiensis) of western Africa and especially Liberia that may reach a weight of nearly 600 pounds (270 kilograms)
Note: In addition to its smaller size, the pygmy hippopotamus differs from the common hippopotamus (Hippopotamus amphibius) in being nocturnal and less aquatic and in having a rounder head with the eyes set to the sides, less webbing between the toes, and only one pair of lower incisor teeth.
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Merriam-Webster unabridged
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