CRAIG K. LORENZ / SCIENCE PHOTO LIBRARY CRAIG K. LORENZ / SCIENCE PHOTO LIBRARY
Northern Elephant Seal (Mirounga angustirostris) females give birth to a single pup. Pups are black at birth and may weigh up to 65 pounds. Pups molt the black coat and replace it with a silver coat similar to the adults about a month after birth. The female nurses the pup for about a month and the pups may triple their weight during the nursing period. San Simeon, Ca.
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