| A | B |
| Poaching | Illegal hunting of animals |
| Exotic Species | Species not normally found in a particular region |
| Threatened Species | Species most likely to become endangered |
| Extinct Species | A species that is no longer found on Earth |
| Endangered Species | Numbers fallen so low that it's most likely to become extinct |
| Keystone Species | Any species that is essential to the health of an ecosystem |
| Habitat Destruction | Main reason for the extinction of species today |
| Germ-Plasm Bank | Storage for seeds of plants that may become extinct |
| Biodiversity | Number and variety of species on Earth |
| Scientific Name | Composed of the Genus and Species |
| Desert Tortoise | Herbivore that lives in burrows |
| Sea Otter | Mammal with the densest pelt or fur |
| Grizzly Bear | Omnivore that primarily lives a solitary life |
| Gray Wolf | Successly reintroduced endangered animal that lives in pack |
| Endangered Species Act | States that a recovery plan is prepared for all threatened animals |