Behavior Sotalia is found to be most active in early morning or late afternoon. It is a slow swimmer and rarely jumps from the water. However, in the wild populations this species displays acrobatics and behaviors such as vertical and lateral jumps, somersaults, surfing in the waves of the boats, and rolling on the surface of the water. Captive tucuxi do not display aerial stunts voluntarily. The two types of tucuxi have similar social groupings with 1-30 individuals.
Groups often swim in perfect synchrony.
The rates of the clicks are 10-70 per second when animal is moving. The short pulses and high rates of repetition allow distinction of objects at distances less then 15 cm. Whistling has also been reported in the wild riverine tucuxi, and a higher frequency whistle has been reported when the animals are agitated in captivity. Aggressive behavior occurs amongst males during breeding season. Habitat S. fluviatilis can be found in fresh or salt water.