Snails have shells the moment they're born, but it's kind of hard to tell. In fact, it's hard to even see a baby snail. Some are nearly microscopic, such as Angustopila psammion, whose adult-sized ...

Hermit crabs are essentially recyclers, taking cast-off resources and reusing them, and in the process cleaning up the beaches. If they can’t find a shell that fits, they will sometimes end up wearing ...