![]() ![]() The species Inia geoffrensis was described by Henri Marie Ducrotay de Blainville in 1817. It is difficult to train and a high mortality rate is seen among captive individuals.Īn Amazon river dolphin as depicted in Brehms Tierleben, 1860s It is the only species of river dolphin kept in captivity, mainly in Venezuela and Europe. While hunting is a major threat, in recent decades greater impacts on population have been due to the loss of habitat and inadvertent entanglement in fishing lines. In 2008, this species was ranked by the International Union for Conservation of Nature (IUCN) as being data deficient, due to the uncertainty regarding its population trends and the impact of threats. They also consume other animals such as river turtles and freshwater crabs. They have one of the widest ranging diets among toothed whales, and feed on up to 53 different species of fish, such as croakers, catfish, tetras and piranhas. The fin size, unfused vertebrae, and its relative size allow for improved manoeuvrability when navigating flooded forests and capturing prey. The dorsal fin, although short in height, is regarded as long, and the pectoral fins are also large. Like other toothed whales, they have a melon, an organ that is used for bio sonar. Sexual dimorphism is very evident, with males measuring 16% longer and weighing 55% more than females. Adults acquire a pink color, more prominent in males, giving it its nickname "pink river dolphin". The Amazon river dolphin is the largest species of river dolphin, with adult males reaching 185 kilograms (408 lb) in weight, and 2.5 metres (8.2 ft) in length. The three subspecies are distributed in the Amazon basin, the upper Madeira River in Bolivia, and the Orinoco basin, respectively. araguaiaensis) within the clade is still unclear. humboldtiana (Orinoco river dolphin) while position of Araguaian river dolphin ( I. boliviensis ( Bolivian river dolphin) and I. Three subspecies are currently recognized: I. The Amazon river dolphin ( Inia geoffrensis), also known as the boto, bufeo or pink river dolphin, is a species of toothed whale classified in the family Iniidae.
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