| Term | Definition |
| tail | a part of the body of an animal attached to the base of the back |
| wing | one of the movable, usually long and flat, parts on either side of the body of a bird, insect, or bat that it uses for flying |
| feather | one of the long, light objects that cover a bird’s body |
| beak | the hard, pointed part of a bird’s mouth |
| gill | the organ through which fish and other water creatures breathe |
| lung | either of the two breathing organs in the chest of people and some animals |
| fur | the soft, thick hair that covers the bodies of some animals |
| tentacle | a long, thin, arm of some sea animals, such as the octopus and jellyfish |
| scale | any of the thin pieces of hard skin covering the bodies of fish, snakes, and lizards |
| fin | a thin, wing-shaped part of a fish that helps it to swim |
| shell | the hard outer covering of some animals |
| exoskeleton | a hard outer layer that covers and protects the body of some animals such as insects |
| mammal | Vertebrate. Most have fur or hair. They breath with lungs |
| bird | Vertebrate. Thet have wings, feathers and beak. They breath with lungs |
| fish | Vertebrate. They have scales and fins. They breath with gills. |
| amphibian | Vertebrate. They have moist skin. They live on land and in water. |
| reptile | Vertebrate. They have scales. Some of them have legs. |
| vertebrate | Animal with a backbone. |
| invertebrate | Animal without a backbone. |
| arthropods | Invertebrate. Insects, arachnids, myriapods, and crustaceans. |
| mollusks | Invertebrate. Soft body. They can have a shell. |
| omnivore | Animals that eat animal and plants. |
| carnivore | Animals that eat other animals. |
| herbivore | Animals that eat plants. |
