There are around 20 species of armadillo, but only the nine-banded armadillo is found in the U.S. This post from rwpzoo ...

While sneaking up on prey, cuttlefish employ a dynamic skin display to avoid detection in last moments of approach, researchers have found.

Amphibians also have special skin glands that produce useful proteins. Some transport water, oxygen, and carbon dioxide either into or out of the animal. Others fight bacteria or fungal infections.