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"It's what we call a tridactyl print. It's got these three toes that are very, very clear in the print."

As you can see from the diagram here, tridactyl jerboa feet look remarkably like those of birds.

The tridactyl species are as expert climbers as any members of the family, and are extremely hardy birds, too, some of them dwelling the year round in cold northern climates, where the food question must often be a serious one.

Curious to tell, several species of woodpeckers are tridactyl—that is, three-toed—and still more curious is the fact that in their case the true hind toe is lacking, while the outer front toe is bent backward, or "reversed," as it is called, and is thus made to do service for a hind toe.

The upper Miocene genera, Protohippus and Hipparion are, to all intents and purposes, modern in character, but their smaller size, tridactyl feet and somewhat shorter-crowned teeth are reminiscences of their ancestry.