Ecology and Behavior
Dusky dolphins prefer cool, upwelling waters as well as cold currents. They largely live in inshore waters and can be found up to the outer continental shelf and in similar zones in offshore islands. Dusky dolphins can move over great distances (around 780 km) but have no well defined seasonal migrations. However, dolphins off Argentina and New Zealand make inshore and offshore seasonal and diurnal movements. In Argentina, dusky dolphins associate closely with southern right whales and South American sea lions. They have been found around bottlenose dolphins but apparently do not interact with them; and may share feeding areas with Risso's dolphins. They also associate with various seabirds like kelp gulls, cormorants, terns, shearwaters, petrels and albatrosses. In New Zealand, dusky dolphins mingle with common dolphins. Dusky dolphins have also been observed with southern right whale dolphins and pilot whales off southwestern Africa.
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