They have pale yellow or grey upper parts, and a black tail tip. Overall, viscachas look like rabbits. They have long, fur covered ears, edged with a fringe of white fur.
All feet have four digits.
Food Habits Mountain viscachas are reputed to eat just about any plant they encounter. Reproduction Mating occurs from October through December. After a gestation of 120-140 days, a female gives birth to a single, precocious young. The young are born fully furred, with their eyes open, and are able to eat solid food on their first day of life. Nursing continues for eight weeks.