Snails getting ready for winter are natural carpenters. They construct doors, or maybe you'd call them walls, inside their shells. They do this... "I am going to withdraw from the world," says a snail ...

Hermit crabs are more than happy to let snails build them a perfect home. Hermit crabs are obsessed with snail shells. These crafty little crabs, found in California's rocky intertidal zone, are more ...