Working on your Halloween costume? 👻🎃🤖💀 Some animals are in costume all year round! These are collector snails in the genus Xenophora, a group of marine snails. As they grow these snails collect rocks shells and other debris to attach to their shells. This weird behavior makes these snails much harder to find on the ocean floor in shallow water. In the 1800s these shelled held people’s imaginations as a little sample of a faraway underwater world. A postage stamp was made to commiserate this lovely little mollusc.