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Elephant seals (Mirounga angustirostris) showing extreme sexual dimorphism (difference between sexes). Male elephant seals can be 3-4 times as massive as females. Central California.
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| Elephant seals in the surf, showing extreme dimorphism, males (5000 lb) are triple the size of females (1700 lb). Central California. Image: 15497 Species: Mirounga angustirostris |























