In especially arid regions, some frogs burrow underground. For example, Arenophryne rotunda of the coastal sandhills of Western Australia burrows underground using its front feet (entering head first - other frogs tend to burrow backwards). This frog is especially suited to such burrowing, having a pad of dead tissue on its snout (like a callus), which protects the living tissue underneath. Another Australian burrower is the Crucifix Frog or Holy Cross Toad (Notaden benetti):
The frog which grows up to 5cm gets its name from the cross-shaped pattern on its back. It spends most its time underground and feeds mainly on small black ants.