Definition of "pygmy hippopotamus" []

• A small hippopotamus (Choeropsis liberiensis) of Liberia and Côte d'Ivoire, found in lowland forests and swamps. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "As the island became isolated from Africa by geological splitting that widened and deepened what we now call the Mozambique Channel, only a few other mammal lineages got aboard: lemurs, rodents, viverrids, and the ancestors of that pygmy hippopotamus you’ve already heard about."