Claudio Mello was conducting research in Brazil’s Atlantic Forest about 20 years ago when he heard a curious sound. It was high-pitched and reedy, like a pin scratching metal. A cricket? A tree frog?

Anna's hummingbird flying in the experimental setup, drinking sugar water from a fake flower. Credit: Lentink Lab / Stanford University. Anna's hummingbird flying in the experimental setup, drinking ...

Merlin was on the job at Westwood Hills Nature Center in St. Louis Park one recent day, helping birders identify bird songs. Not Merlin the storied magician, although what was happening could be ...

A bird call has gone viral and taken people who grew up in the 2000s right back to their childhoods. I remember the same sound waking me up as a kid and soundtracking my teenage years. I asked an ...