Angela Sayre, the founder of Crustacean Plantation, shared a video of a hermit crab changing shells in Florida to help raise awareness about shell shortages.

Mussel shells provide living space for insects and plants ... Water pollution has wreaked havoc on these clean-water-loving animals, and dams have deteriorated water quality and separated mussels from ...

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.

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 ...

The animals constantly grew new shell material as they aged ... formed intricate patterns that may have given later ammonites greater buoyancy control. The ammonites came to an end 66 million ...

Buried bone and shell contain tiny air spaces ... for example, scientists have found dozens of bizarre, previously unknown animals. Interpretation of fossils poses another set of challenges ...