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In the 1800s, elephant seals were in danger of extinction, pursued by relentless hunters who sought their blubber as a source of oil. In Challenge of the Seas, Vol. 26: Seal Country, students can see how their numbers have greatly increased. The population of elephant seals is particularly dense in California, where the rich coastal waters provide abundant food. In this series of programs, information regarding the health of the world's oceans is given to heighten student awareness about the many problems of marine systems.