Can Grey Parrots (Psittacus erithacus) Succeed on a "Complex" Foraging Task Failed by Nonhuman Primates (Pan troglodytes, Pongo abelii, Sapajus apella) but Solved by Wrasse Fish (Labroides dimidiatus)?

Linking specific cognitive abilities of nonhuman species on a laboratory task to their evolutionary history-ecological niche can be a fruitful exercise in comparative psychology. Crucial issues, however, are the choice of task, the specific conditions of the task, and possibly the subjects' und...

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