51.   They replace pesticides with natural predators, and fertilizers with animal dung, crop wastes and plants that fix nitrogen from the air.

52.   They have no known natural predators here, so controlling them is almost impossible.

53.   They have no natural predators here, and there are no known insecticides to control them.

54.   White pox looks somewhat like an attack by the coral-eating snail, or Coralliophyla, a natural predator of elkhorn coral.

55.   With no natural predators, these organisms invade entire eco-systems, killing indigenous undersea flora and fauna.

56.   While there are natural predators such as beetles, flies, and egg parasites that prey on gypsy moths, their numbers are no match for an epidemic.

57.   Wolves and other natural predators are long gone.

58.   With no natural predator, they multiplied like insects.

59.   Wolves are natural predators of elk, and elk like to munch on aspen suckers in the winter, stunting the trees.

60.   You can also cut down on crickets and roaches around your house by providing chemical-free habitats for lizards, their natural predators.