The greater honeyguide, a small drab bird of African woodland, leads people to bees’ nests: it chatters, flies a little way, waits, flies on. The people break open the hive and take the honey, and the bird gets the wax, which is what it was after all along. Honey-hunters call it in, and the call depends on where you are. The Yao in northern Mozambique use a trill and a grunt, brrr-hm; the Hadza in Tanzania whistle a little tune. In 2023 researchers played both calls in both places, and the birds answered their own local call two or three times more readily than the foreign one. So a wild bird, which nobody tamed or trained, has picked up a human dialect, and only the one spoken where it grew up. Somewhere in that woodland is a honeyguide that would hear a Hadza whistle and treat it, more or less, as a stranger with an accent from out of town.