31.   Gorillas are the largest of the apes and have no natural enemies except man.

32.   History is littered with ecological disasters that started when an invader species arrived in an area where it had no natural enemies to slow it down.

33.   In periods of drought, plants conserve energy partly by cutting their defense budgets, producing fewer toxic chemicals that repel their natural enemies.

34.   In some parts of the world Turks and Armenians are viewed as natural enemies, but the funeral showed once again that in Istanbul, they live peacefully together.

35.   Instead, he said, agriculture officials hope for some unpeaceful coexistence of the pest and a natural enemy.

36.   One million beetles that are natural enemies of the Eurasian plant will be released this summer in federal and state wildlife areas across North America.

37.   Other ideas -- sending out town employees to scream and wave sticks, firing blanks from cannons and introducing natural enemies such as swans -- had all previously failed.

38.   Pictures of Pepperberg meant to please Wart have not provoked a significantly different response than pictures of an owl, a natural enemy.

39.   Our natural enemy had struck again.

40.   The big bruisers that win the big prizes at wine competitions he regards as the natural enemies of all but the richest foods.