Parrotfish often chomp on rocks and crunchy coral exoskeletons. When they ingest this hard material, it must go somewhere. But where? While relaxing on an endless white, sandy beach might be your idea ...

The animals encountered include an exoskeleton-less false coral, an aptly named sea cucumber, and, perhaps the strangest of all, a penis-shape peanut worm that looks more like a peanut when it draws ...

Coral reefs are made up of colonies of hundreds to thousands of tiny individual corals, called polyps. These marine invertebrate animals have hard exoskeletons made of calcium carbonate, and are ...