In The World of Marine Mammals (Orca, $12.95), Mason, a marine biologist who works as a shipboard naturalist for West Coast eco-tours, has also examined the lives of manatees, sea otters, dugongs and other warm-blooded creatures of the sea. Writing for grades four to six, she examines how marine mammals breathe, move, keep warm, find food, communicate, play and fight for survival. Victoria artist Garth Buzzard variously details a gray whale skeleton, how walruses use their heads to break through ice 20 centimeters thick, and sea lions at play. 1-55143-046-0

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