Object permanence in four species of psittacine birds: An African Grey parrot (Psittacus erithacus), an Illiger mini macaw (Ara maracana), a parakeet (Melopsittacus undulatus), and a cockatiel (Nymphic…

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African grays, mini-macaws, budgies, and cockatiels, all exhibit object permanence. http://t.co/gHOd99ese9

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