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.
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The bird’s job is to fly from tree to tree, calling and leading the person on, until the team reaches a bees’ nest. The person’s—more painful—job is to extract the nest.
The oddball partnership arises from complementary skills and deficits. Honeyguides excel at locating bees’ nests, but a bird that tries to steal some of the tasty reward could easily be stung to death. (See “Hello, Honey! 10 Sweet Photos of Bees.”)
Humans can help by wielding axes to chop bees’ nests out of trees and by lighting fires, creating smoke that subdues bees. But humans “are not so good at finding bees’ nests,” says study leader Claire Spottiswoode, a field biologist at the U.K.’s University of Cambridge and the University of Cape Town in South Africa.