Eastern Cottontail rabbits vary in color from grey to brown. Their large hind feet and ears help to regulate their body heat as rabbits don't pant or sweat. They are rather small animals, usually about a foot long and weighing between 2 to 3 pounds. They are most active at dawn and dusk and feed on leafy plants during the growing season and the bark of woody plants in the winter. Hawks, owls, foxes, raccoons, skunks and opossums prey on rabbits and they seldom survive more than a year in the wild.