Tucuxis are found throughout the Amazon and Orinoco River basins and are commonly found near low current confluences and river junctions where food is abundant and less energy has to be expended during foraging bouts. They avoid mud banks and flooded forest areas. The mouth of the Amazon River occurs at its junction with the Atlantic ocean, thus making the first 2 km of the river relatively saline. Although some Tucuxi can be found within this area, they prefer the freshwater habitat found further inland.
Habitat Regions: tropical ; freshwater
Aquatic Biomes: rivers and streams; brackish water
Other Habitat Features: estuarine
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