Quantity counts for baboons

Peanut experiment shows that monkeys roughly compare numbers of nuts using logic similar to humans

monkey portrait

COUNTER INTELLIGENCE  An olive baboon named Pearl, shown here, and one of her troopmates could keep tabs on approximate quantities of peanuts placed one at a time in containers. Researchers say this counting-like logic, which humans use to count exact amounts, comes naturally to monkeys.

Adam Fenster/University of Rochester Photography

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