They're also some of the only animals that can breathe with their butts. You see, inside a turtle shell is a very particular respiratory system. Wojakowski: You will see the lungs towards the top ...

its shell carefully pieced back together. Those were among the 115 animals Dallas Morning News photojournalist Tom Fox and I saw during a recent morning inside this wildlife MASH unit ...

Dr Fraser says "Turtles are very strange animals. They have a straightjacket of a shell. "If you can imagine yourself with your shoulders within your rib cage, you'd be pretty restricted." ...

Gastropods, such as sea snails, have one outer shell while bivalves, such as oysters, scallops and mussels, have two. As they grow, these animals use proteins and minerals to build their shells ...

Instead, hermit crabs have a hard exoskeleton on the front part of their bodies but a soft tail on the other half, which they protect using the discarded shells of other animals, like whelks.

These included brachiopods, which lived in shells resembling those of clams or cockles, and animals with jointed, external skeletons known as arthropods—the ancestors of insects, spiders ...