MONKEY, n. An arboreal animal which makes itself at home in genealogical trees.

An arboreal animal would necessarily use all four limbs, as climbing animals actually do.

Then follows an attempt to reconstruct, from the atavistic characters, a picture of our primitive ancestor who was undoubtedly an arboreal animal.

This was not understood, as the Utes have no sign for the tree squirrel, the arboreal animal not being now found in their region.

They're arboreal animals, meaning that they live in trees and spend most of their time hopping between branches.