11.   Porpoises and sharks are natural enemies.

12.   The doctrine rested on the assumption that the country had no natural enemies and advanced no territorial claims on its neighbours.

13.   There are plenty of natural enemies, such as spiders and bees, so Cambodian farmers have no need for pesticides, according to Koroda.

14.   In the wild, the pair would be natural enemies.

15.   Although they have few natural enemies, brown pelicans have been the quarry of humans for various reasons over the years.

16.   Amazingly, manatees have no natural enemies in Florida.

17.   And in between, danger lies in the social and cultural tensions that have made natural enemies of these separate classes.

18.   And the weevil usually faces a relatively mild threat from its natural enemies, other than man.

19.   And they have few remaining natural enemies, such as the panther, to control their numbers.

20.   As recent invaders, they have no natural enemies in the United States except you.