31.   Ladybugs are natural predators.

32.   Manatees have no natural predators, Reid said.

33.   Many of the animals and plants brought into the country have proliferated wildly in the absence of their natural predators.

34.   Natural predators?

35.   Natural predators like wolves have been eliminated from much of the north woods.

36.   Natural predators need a wide variety of habitats.

37.   Nor would they be picked off by natural predators, being quite indigestible.

38.   Pests are controlled by their natural predators instead of by sprays and pesticides.

39.   Puttler attacked the thistle with natural predators, scattering plant-devouring weevils around the state.

40.   Scientists are studying effective controls with natural predators.