Staghorn hermit crabs are a unique species of hermit crab due to their shell biology, which is also where they get their name. Their shells are alive and growing; while they may look like coral, they are actually a species of hydrocoral. Hydrocorals are colonial hydroids and are more closely related to jellyfish than true corals, as they are in the same family, cnidaria. Early into the staghorn's lifecycle, a small polyp of these hydroids lands on their shells and over time eats away at the shel

5 Sensational Sea Snail Species - Ocean Conservancy

How To Tell if an Aquarium Snail is Dead - With 5 Easy Ways