Northern Elephant Seals

Northern Elephant Seals, Mirounga angustirostris, vocalizing for dominance at Piedras Blancas Elephant Seal Rookery, located along the central coast of California. Males establish dominance to determine who does the majority of the mating in a harem. The first phase is a distinctive low-frequency, guttural vocalization. The dominance battle can progress to a bloody physical attack.

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From Piedras Blancas Elephant Seal Rookery