"Living well below sea level in Death Valley and also in woodland and grassland up to 2,000 m elevation, Desert Cottontails are able to tolerate diverse habitats. They are most active at dawn and dusk, and spend hot days resting in a burrow or in a ""hide,"" which is a shallow depression in the ground or in vegetation. Like all rabbits, they are vegetarians, feeding on grasses, shrubs, and forbs. They also eat acorns. When they can, they forage under shrubs, and when they venture out from under shelter, they move cautiously, and freeze when alarmed. They breed year-round, and mature quickly: breeding is seen in individuals as young as three months of age."

Links:
Mammal Species of the World
Click here for The American Society of Mammalogists species account