Owing to its apparent shyness and relative scarcity, little is known about the Chilean Dolphin (1) (4) (5). Small groups comprising two to fifteen dolphins are most common, but larger groups of up to 400 have been reported in the northern part of its range (1) (5). It is probably an opportunistic hunter, feeding mainly on crustaceans, cephalopods, and shallow water fishes such as sardines, anchovies and rock cod (1) (2) (5).
Nothing is known about the seasonal movements of this species, but most Chilean dolphins appear to remain resident in a small area (1) (2) (5). Similarly, very little is known about its reproductive biology, other than that young dolphins are more commonly sighted between October and April (4) (5).