This species inhabits the Araguaia- Tocantins river system in Brazil. araguaiaensis), which is physically similar to the Amazon river dolphin, was classified as a separate species in 2014 on the basis of its distinct DNA. In some parts of the Amazon, river dolphins will herd fish into fishermen’s nets in other areas, they will raid the nets instead. They often swim and play with another small dolphin, the tucuxi ( Sotalia fluviatilis), which is found in both fresh and marine waters and is not classed with river dolphins. Amazon river dolphins are usually seen in groups. Corpulent but extremely flexible, this dolphin navigates with the grace of a flying bird among the branches of submerged trees when annual rains flood the forest. Its colour can vary from dark gray to mottled pink-and-gray to bright pink. A male Amazon river dolphin can grow to over 2.4 metres (8 feet) and 160 kg (350 pounds) females are slightly smaller. Also called boto, bufeo, and pink dolphin, it is common in the turbid waters of the Amazon and Orinoco river basins. The largest species is the Amazon river dolphin ( Inia geoffrensis).
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