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Steller's or sea cow - an extinct mammal from sirens order. Reached
7 feet long and weighed 4 tons. Small head smoothly passes into a huge
trunk, which ended with a forked tail, resembling a whale's tail. As
cetaceans Steller's cow has no hind pair of legs. Was opened in 1741 by
G. Steller. As a result of predatory fisheries to the 1768 Steller's cow
had been completely destroyed. Since its official opening and to the
complete disappearance has passed just 27 years. Lived in the waters of
the Commander Islands and is probably off the coast of Kamchatka and
Northern Kuriles. This animal has no teeth because its main food was
the largest marine algae and other aquatic plants. Because of the
herbivorous diet of these extinct animals it’s called sea cows. Fossil
remains of sea cows are close or even identical to Steller was found in
Pacific coastal areas from California to Japan. The population of
sea cows, described by Steller, was a pathetic remnant of the
once-prosperous genus, destroyed by the Pacific natives.
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Embolotherium ergilense - representatives of the
brontoterieds family the perissodactyle’s order. These are large
terrestrial mammals, larger than the rhino. Like all rhinos, a feature
of the limbs of these animals was the reliance on the tips of the
fingers, so they were digitigrade. The group was well represented in
savannah landscapes of Central Asia and North America, mainly in the
Oligocene. Members of the emboloteries genus, well known from Lower and
Middle Oligocene’s locations in Mongolia and China. Embolotherium
ergilense possibly synonymous Andrews. Found skull belonged to an old
male, so that probably differ between Ergil Embolotherium and Embolotherium andrewsi - age and sex. Nasal ram, however that may be,
was very wide and massive and quite lifted up. This sample differs also
the location of the orbits, shorter and more concave frontal bone, a
wider neck and other features. The size of the skull - 125 cm
condylobasal’s length implies ergilensises growth from a large African
elephant above 4 m at the shoulder and weighs about 7 tons.
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Arctotherium is an extinct genus of South American short-faced bears
within Ursidae of the late Pliocene through the end of the Pleistocene.
Their ancestors migrated from North America to South America during the
Great American Interchange, following the formation of the Isthmus of
Panama. They were endemic to South America, living from ~2.0–0.01 Ma,
existing for approximately 1.99 million years. Their closest relatives were the North American short-faced bears of genus Arctodus.
The closest living relative would be the spectacled bear. A skeleton
of Arctotherium angustidens from Buenos Aires indicates big males of
this species would have weighed 1.6 tonnes, standing 11 feet (3.4
meters) tall, making it the largest bear known.
In contrast to their North American cousins, South American short-faced
bears showed a trend of declining size and carnivory over time. This
has been attributed to increased competition form other later-arriving
or evolving carnivorans following the early dispersal of short-faced
bears to South America. (The North American carnivorans that invaded
South America, including short-faced bears and Smilodon
, quickly dominated the predatory niches formerly occupied by South
America's native metatherian sparassodont and avian phorusrhacid
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