- Abdomen
- The hind end of a crustacean, containing the digestive and reproductive organs.
- Camouflage
- Something that hides an animal by changing how it looks
- Carapace
- A hard, protective outer shell
- Carnivore
- An animal that eats other animals
- Crustacean
- An aquatic animal with a hard outer shell and a three-part body - head, thorax, and abdomen (shrimp, crab, lobster, and barnacle)
- Echinoderm
- A spiny-skinned animal (starfish and sea urchin)
- Eyestalk
- A moveable column with an eye at the tip
- Gastropod
- A type of mollusk, usually - but not always - with a distinct head and a spiral shell
- Gland
- An organ that produces a liquid
- Invertebrate
- An animal with no backbone
- Mollusc
- A soft-bodied invertebrate, usually enclosed in a hard shell
- Regeneration
- Regrowing lost or destroyed parts of the body
- Siphon
- A tube through which an animal sucks in or pushes out water
- Tentacle
- A flexible limb that sticks out near an animal's head, usually used to feel
- Thorax
- The middle section of the body of a crustacean, located between the head and the abdomen