Snails: Snails are a type of gastropod mollusk that have a spiral-shaped shell on their back.
Clams: Clams are a type of bivalve mollusk that have two shells that are hinged together.
Oysters: Oysters are also a type of bivalve mollusk that have two shells that are hinged together, but they are flatter and more irregularly shaped than clams.
Nautilus: The nautilus is a cephalopod mollusk that has a coiled, chambered shell that it uses for buoyancy and protection.
Turtle: Turtles are reptiles that have a hard, protective shell that covers their body.
Armadillo: Armadillos are mammals that have a tough, bony shell covering their body.
Lobster: Lobsters are crustaceans that have a hard exoskeleton, or shell, that protects their body.
Crab: Crabs are also crustaceans that have a hard exoskeleton that covers their body.
Abalone: Abalone are a type of marine snail that have a single, flat, ear-shaped shell.
Conch: Conch are large marine snails that have a large, spiral-shaped shell that is often used for decoration or as a musical instrument.