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When humans speak up, the little African birds called honeyguides listen—and can understand, a new study confirms for the first time.  Honeyguides in northern Mozambique realize that when a man makes a special trilling sound, he wants to find a bees’ nest—and its delectable honey.  Birds that hear this trill often lead human hunters to a nest, receiving a reward of honeycomb.

http://tinyurl.com/jtp2wkk

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