Intelligence: The intelligence of Amazon River dolphins has not been extensively tested. Their encephalization quotient (the ratio of brain mass to body weight) compares favorably with that of the bottlenose dolphin (Tursiops). The gray dolphins tend to be more "cautious" than the pink dolphins, perhaps because of their small size and very delicate skin. On the other hand, Inia is known for its highly developed sense of curiousity and it rapidly associates with man in a variety of serious and playful ways.
Pink Dolphins
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