snail , armadillo
shells, skins, cocoa beans, animals, and animal skins
mollucs are animal with slimy bodies and shells
They are made an animal that lives in the sea.
There is no such thing as a pool animal.
a clam
The mussel, a bivalve, has two valves, or shells.
Reptiles
limestone
Animal Horn or conche Shells
Limestone in various forms such as chalk and coquina.
The sea animal that makes chalk tubes on stones and shells is barnacles. Barnacles will attach themselves to whatever is handy and multiply very fast.
Plant and animal waste, shells and skeletons