They were fitted to crack the shells of nuts.

Bodo often cracked nuts with his teeth.

But sometimes he found nuts that he could not crack.

He had never seen or heard of a hammer, so he threw a hard nut against a rock.

The nut did not crack.

So he kept on trying different ways.

At last he struck the nut with a stone.

Its hard shell broke.

How glad Bodo was!

He ate the kernel and then cracked some more nuts with the stone.