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Steller's sea cow (Hydrodamalis gigas) is an extinct sirenian described by Georg Wilhelm Steller in 1741. At that time, it was found only around the Commander Islands in the Bering Sea between Alaska and Russia; its range extended across the North Pacific during the Pleistocene epoch, and likely contracted to such an extreme degree due to the glacial cycle.
They reached up to 9 metres (30 ft) in length, making the Steller's sea cow among the largest mammals other than whales to have existed in the Holocene epoch. [3] Steller's sea cow was first described by Georg Wilhelm Steller, [4] Cuesta by Daryl Domning, [5] and Takikawa by Hitoshi Furusawa. [2]
Extinct due to overfishing, predation by the sea lamprey which colonized the lakes in the 1940s, and hybridization with other ciscoes. [89] Deepwater cisco: Coregonus johannae: Lakes Michigan and Huron Last collected in Lake Michigan in 1951, and in Lake Huron in 1952. Extinct due to overfishing, sea lamprey predation, and hybridization with ...
The recently extinct Steller's sea cow was the largest known sirenian to have lived, reaching lengths of 10 metres (33 feet) and weights of 5 to 10 tonnes (5.5 to 11.0 short tons). [ 2 ] Sirenians have a large, fusiform body which reduces drag through the water and heavy bones that act as ballast to counteract the buoyancy of their blubber .
Georg Wilhelm Steller (10 March 1709 – 14 November 1746) was a German-born naturalist and explorer who contributed to the fields of biology, zoology, and ethnography.He participated in the Great Northern Expedition (1733–1743) and his observations of the natural world helped the exploration and documentation of the flora and fauna of the North Pacific region.
We can study animals from all over the world thanks to science, but what about those that no longer exist? The list of extinct mammals could go on for ages, but each animal has a unique story.
The dugong (/ ˈ d (j) uː ɡ ɒ ŋ /; Dugong dugon) is a marine mammal.It is one of four living species of the order Sirenia, which also includes three species of manatees.It is the only living representative of the once-diverse family Dugongidae; its closest modern relative, Steller's sea cow (Hydrodamalis gigas), was hunted to extinction in the 18th century.
A long time ago An artist's impression shows a prehistoric sea cow's demise about 15 million years ago. By analyzing a rare fossil, researchers pieced together how the sea cow perished.