61.   Pine beetles are devouring trees throughout the South, prompting a bug war with their natural predators that agriculture officials are counting on to halt the invasion.

62.   Over the years, a lack of natural predators allowed the foreign invaders to expand their domain, colonizing and wiping out fragile natural vegetation.

63.   A search of the scientific literature revealed that no pesticide or natural predator could be used to fight the beetles.

64.   Environmental groups oppose the use of pesticides, claiming the chemicals alter the environment and kill species such as ladybugs and other natural predators.

65.   He notes that insects can develop a resistance to pesticides, but not against natural predators.

66.   He notes that insects can develop a resistance to pesticides but not against natural predators.

67.   Like many endangered species, sea turtles face threats ranging from natural predators to poachers.

68.   One problem is the nonnative hyacinth and hydrilla, weeds that have no natural predator in the Rio Grande.

69.   Reasons offered for the southward migration of seals include overpopulated waters, depletion of fish stocks on which they feed and a reduction in natural predators such as sharks.

70.   Searing sunshine and a lack of natural predators have resulted in bank-to-bank growth of the hyacinth.