51.   Keiko is a symbol for freeing marine mammals from captivity.

52.   Kim Thounhurst, a marine mammal specialist at the National Marine Fisheries Service, said that voluntary efforts to work with mariners seem to be helping.

53.   Lately it has opened a new Manatee Springs exhibit, home to Douglas and Stoneman, a pair of the endangered cowlike marine mammals from the Florida coast.

54.   Levels are higher in the transient orcas because the seals and other marine mammals they eat are closer to the top of the food chain.

55.   Meanwhile, large numbers of marine mammals, sea turtles and sea birds are inadvertent casualties of commercial fisheries around the world.

56.   Most marine mammals that are found dead appear emaciated.

57.   More injured or sick smaller animals may be rehabilitated here, but no additional large marine mammals are expected as permanent residents.

58.   Next week, resource agencies will begin a search for sick marine mammals along the coast from San Diego north to Santa Barbara.

59.   Navy officials deny the sound will hurt whales and have added a device that can detect whether any marine mammals are within a kilometer.

60.   Oceanic Society Expeditions offers volunteers opportunities to research sea birds and marine mammals, including whales, dolphins and manatees.