CRAIG K. LORENZ / SCIENCE PHOTO LIBRARY CRAIG K. LORENZ / SCIENCE PHOTO LIBRARY
Northern Elephant Seal (Mirounga angustirostris) adult males and females aggregate at breeding colonies from December through February each year. Males establish territories and females aggregate in the territoties. The Northern Elephant Seal is the only mammal known to make two long-distance migrations in a year. They travel from their breeding colonies in Mexico and California to Alaska to feed and then return to their breeding colonies to molt. They may travel up to 21,000 miles in a year, the longest migration known for any mammal. San Simeon, Ca.
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