Steller's sea cow

Steller's sea cow was a giant, plant-eating marine mammal of the North Pacific, related to dugongs and manatees. European hunters drove it extinct within decades of its documented discovery in 1741.

Vitus Bering: A Danish-born explorer who led Russian expeditions across the North Pacific. His 1741 expedition reached the Commander Islands, where the sea cow was documented.
Sirenia: An order of aquatic, plant-eating mammals that includes manatees and dugongs. Steller's sea cow was the largest known member of this order.
Leonhard Stejneger: A Norwegian-American zoologist who studied the natural history of the Commander Islands. His historical research reconstructed the sea cow's decline and extinction from expedition records.
Extinction: The permanent loss of a species when its last individual dies. Steller's sea cow is a documented case of extinction caused by intense human exploitation.
Extinction debt: The delayed loss of species after environmental change has already made their survival unlikely. It raises a question about whether the sea cow's population was already declining before direct hunting began.
Georg Wilhelm Steller: A German naturalist who joined Russian expeditions to the North Pacific and recorded its wildlife. His detailed account supplied the earliest scientific description of the sea cow.
Dugong: A marine mammal that grazes on seagrass in the Indo-Pacific and is the sea cow's closest living relative. Its anatomy and ecology help distinguish the extinct sea cow's adaptations from those of living sirenians.
Steller's journal: Georg Wilhelm Steller's account of the 1741 expedition and the animals it encountered. Its observations remain a primary source on the sea cow's appearance and behavior.
Overhunting: The removal of wild animals at rates that their populations cannot sustain. Hunters killed sea cows for meat, fat, and hides faster than the small population could recover.
Population bottleneck: A sharp reduction in a population's size that lowers its genetic diversity. The sea cow's restricted known range invites investigation into how small or isolated its population had become.

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OverexploitationBroader topic: Its rapid loss is a stark case of exploitation exhausting a small, vulnerable population.