Mule Deer, named for their large ears, are found throughout western North America and are usually associated with mountainous regions from Canada into Mexico. There are a number of subspecies, distinguished from one another mostly by physical characteristics. The desert mule deer is found in mid to high elevation grass and scrub-lands of the Sonoran and Chihuahuan deserts. Mule deer eat a wide variety of vegetation types, and will change their diet depending on season, habitat and availability of preferred food. They favor habitats where they can hide among trees and shrubs and will remain in an area as long as there is vegetation to eat. Deer live in small herds and are most active at dusk and dawn. When living close to humans, they are not shy and will stroll casually through yards, eat gardens and even bed down next to houses.