| Term | Definition |
| Adaptation | any body part, behavior, or physiological capability that increases an animal's ability to survive in its environment |
| Behavior | anything an animal does involving action and/or response to stimulation |
| Camouflage | coloration that blends in with the surrounding environment |
| Ecosystem | a unit of plants, animals, and non-living components of an environment that interact |
| Environment | the total surroundings and forces that act upon a living thing |
| Endangered species | a species of plant or animal of which numbers are decreasing at an alarming rate and is threatened with extinction by human-made or natural changes in the environment |
| Extinct | no longer existing on the Earth |
| Habitat | the place where an animal lives |
| protective coloration | a type of camoflage in which the color of an animal blends in with its background protecting the animal against predators |
| protective resemblance | a type of camouflage in which the color and shape of an animal blends in with its background protecting it against predators |
| behavioral adaptation | an adjustment in an organisms behavior |
| structural adaptation | adjustments to internal or external physical structures |
| hibernation | a period of inactivity during winter |
| mimicry | an adaptation in which an animal is protected against predators by its resemblance to another unpleasant animal |
| pseudobulbs | storage organs that store water for plants like orchids |
| migration | a seasonla movement of animals to find food, or reproduce in better conditions or find a less severe climate |