1.   Compared with them, the Novel appears to be a creature from an alien species.

2.   I watched with interest - it was like observing the gyrations of an alien species, a praying mantis or something.

3.   Indeed the most dramatic example of mass extinction known to biology has been caused by the introduction of an alien species.

4.   Nor was its bare face the ethereally lovely, angular visage of that alien species.

5.   And Starfleet is very, very young and this crew has met very few alien species since the Vulcans arrived.

6.   Alien species are displacing native ones.

7.   But all this was nothing compared with the damage wrought by the sudden profusion of alien species unintentionally imported by ships from overseas.

8.   But a number of scientists question the assumption that alien species are never acceptable in a natural ecosystem.

9.   But the invader grasses that are making inroads into the Mojave are one of the most vivid examples of the havoc alien species can wreak.

10.   But some scientists question the assumption that alien species are never acceptable in a natural ecosystem.