Horses in snow

The term horse commonly refers only to the domestic Equus caballus and to the wild Przewalski’s horse, E. przewalski. (Other so-called wild horses are feral domestic horses or their descendants.) Adapted to plains environments, all Equus species, including the ass and the zebra, have lengthened foot bones ending in a single toe covered by a hoof, for fast running; teeth shaped for grinding grass; and intestinal protozoa for digesting cellulose.

Photographer: Ferdinand Equus