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Largest Extinct Mammals

Ground sloths megatherium. Extinction of taxa is difficult to confirm as a long gap without a sighting is not definitive but before 1995 a threshold of 50 years without a sighting was used to declare.

Art Illustration Prehistoric Mammals Indricotherium Was The Largest Land Mammal Of All Time Was Related To The Rhinoceros B Fosiles Prehistoria Animales

Basilosaurus was once recognized as one of the largest known extinct cetaceans at 18 metres 59 ft in length.

Largest extinct mammals. Recently extinct mammals are defined by the international union for conservation of nature iucn as any mammals that have become extinct since the year 1500 ce. The largest fossil toothed whale was the miocene whale livyatan melvillei which was estimated to be 13 5 17 5 m 44 57 ft in length. Monotremes monotremata the largest known monotreme egg laying mammal ever was the extinct long beaked echidna species known as zaglossus hacketti known from a couple of bones found in western australia it was the size of a sheep weighing probably up to 30 kg 66 lb.

Fossils of complete skeletons have been found in the native australia where the creatures are also called giant wombats. The largest individuals of the steppe mammoth of eurasia mammuthus trogontherii estimated to reach 4 5 meters 15 ft at the shoulders. Weighing up to 3 tons diprotodon is the largest marsupial known to have ever existed before going extinct around 46 thousand years ago.

The biggest specimens have been about the size of a hippo. Larger than today s largest land mammal the african bush elephant which can reach 4 meters at the shoulders but smaller than the palaeoloxodon namadicus. Nobu tamura wikimedia commons unlike the other mammals on this list basilosaurus can t lay claim to being the largest ever of its breed that honor belongs to the still extant blue whale which can grow to as much as 200 tons.

Since then roughly 80 mammal species have become extinct. Marsupials marsupialia the largest known marsupial is the extinct diprotodon about 3 m 9 8 ft long standing 2 m 6.

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