| Term | Definition |
| molting | shedding or replacing the exoskeleton |
| omnivore | an organism that eats both plants and animals |
| organism | any plant or animal |
| pincers | large claws |
| regeneration | regrowth of lost body parts |
| response | reaction by an organism to a stimulus |
| scavenger | an animal that feeds on dead or decaying matter |
| stimulus | a change in the environment that causes an organism to do something |
| survival | the act of remaining alive |
| swimmerets | on the underside of the abdomen. They are used to move water and carry eggs |
| tail | the last section of the abdomen used for swimming |
| territory | an area inhabited by an animal or group of animals |
| thorax | middle part of the crayfish |