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We've all caught ourselves yawning right after a friend yawns, and some people even describe this phenomenon with their pet dogs and...

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Jays "weigh" peanuts, choose heavier ones

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The astounding client-customer relationship in cleanerfishes: undersea barber's poles, individualized grooming dynamics, and the intrinsic value of massages

Why don't big predatory fish eat cleaner fish, the small reef-dwellers who groom and eat parasites off of their customers? Because...

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