On the African savanna, a fascinating and unprecedented partnership between people and wild birds gets started with a simple "brrr-hm." The human-honeyguide alliance was first documented in the 1500s, but some experts believe it might stretch back to Homo erectus, which would put it at about 1.9 million years old. The female honeyguide lays a single egg in multiple nests. By doing so, she spreads out the risk to multiple hosts and ensures more of her eggs survive.
