Pangolins are specialized to eat ants and termites. Waddling along on short legs, they use their keen sense of smell to locate insect nests. Digging into them with sharp claws, they create entry holes into which they can insert their tongues. A pangolin tongue is anchored way back inside its body near the hind limbs and is longer than the pangolin's body. As a pangolin rapidly flicks its tongue in and out gathering up insects, it consumes sand and small stones, too. A pangolin has no teeth, and its tongue carries the insects straight to its stomach. Its large muscles churn the insect bodies, grinding them against the sand and stones and breaking them down. Protruding stomach spines made of fingernail material (keratin) cause additional breakdown as food bangs against them. Even a pangolin's eyes are specialized for its diet; they are protected from insect bites by thick eyelids.