21.   Because the marine mammals are known to travel with certain species of tuna, fishermen have often used dolphins as indicators for large numbers of fish.

22.   Both teens are considering careers with marine mammals.

23.   All are cosmopolitan in distribution, reach large sizes and regularly consume large prey such as marine mammals, sea turtles and fish.

24.   All are cosmopolitan in distribution, reach large sizes and consume large prey such as marine mammals, sea turtles and fish as normal elements of their diets.

25.   But if several environmental activist groups have their way, the Navy project will be torpedoed by federal agencies responsible for protecting marine mammals from human disruption.

26.   But some believe that the United States is caving in to political pressure from Mexico, and that the new rules would put marine mammals at risk.

27.   But the big stars of the aquarium boom are the marine mammals.

28.   But the project leaders must first overcome the suspicions of environmental activists who charge the new sonar will harass and threaten migrating whales and other marine mammals.

29.   But they serve as meals for many fish, marine mammals and birds.

30.   Cordaro said it may be the start of a trend, an inevitable effect of Mother Nature on a burgeoning population of marine mammal.