 Its front legs grow to be 10 to 20 cm (3.9 to 7.9 in) and the back legs can grow to be 20 to 30 cm (7.9 to 11.8 in) long.The antelope jackrabbit's ears grow to be 14–17 cm (6 in) and it can weigh up to .This species has a very large skull and a long rostrum.