collecting cuckoo alarm calls from all over the world, including Africa, India, China, Indonesia, and Japan to see if birds from different countries respond to one another’s cuckoo alarm calls. “It would make sense from an evolutionary standpoint that host species in different parts of the world have converged on a common cuckoo alarm call,” says Feeney. “Cuckoos are a unique kind of superweird threat—they’re no danger to the adults, just to the young.
