The rabbit's long ears, which can be more than 10 cm (4 in) long, are probably an adaptation for detecting predators. They have large, powerful hind legs. The two front paws have 5 toes, the extra called the dewclaw. The hind feet have 4 toes.[5] They are plantigrade animals while at rest; however, they move around on their toes while running, assuming a more digitigrade form. Unlike some other paw structures of quadruped mammals, especially those of domesticated pets, rabbit paws lack pads.[citation needed] Their nails are strong and are used for digging; along with their teeth, they are also used for defense.[citation needed]