| endangered species | 68.53 | Pandas are an endangered species. | ||
| new species | 14.48 | New species evolve in short order. | ||
| different species | 11.59 | Angels are a different species. | ||
| native species | 7.57 | They compete with our native species. | ||
| rare species | 7.37 | Many were rare species, they said. | ||
| protected species | 6.32 | Spotted owls are a protected species. | ||
| threatened species | 5.79 | Rescuing all threatened species is impossible. | ||
| animal species | 5.20 | Animal species made extinct. | ||
| the species | 4.81 | The two species are quite similar. | ||
| human species | 3.88 | A good example is the human species. | ||
| same species | 3.75 | Cougars and panthers belong to the same species. | ||
| exotic species | 2.70 | It has hundreds of exotic species. | ||
| marine species | 2.44 | Other marine species also are attracting interest. | ||
| particular species | 2.44 | The name of that particular species is in there though. | ||
| related species | 2.04 | ...closely related species. | ||
| alien species | 1.97 | Alien species are invading cities, too. | ||
| single species | 1.97 | The genus contains only a single species. | ||
| common species | 1.84 | The red-tailed hawk is a common species. | ||
| invasive species | 1.65 | Case is chagrined to see another invasive species come to California. | ||
| non-native species | 1.51 | The grass carp are a non-native species. |