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?

Did you happen to hear a strange chirping sound at some point today, causing you to look around the room, perplexed, convinced that a small bird had somehow entered your home? Did you look it up ...

I was recently creeping through a clearing of downed trees in a wooded Brooklyn park with my iPhone in hand. Birds were singing everywhere, but through the din, I was recording a peculiar song: It was ...

Please listen to the attached audio clip. For the last few nights a bird has been chirping in our backyard, but since it’s dark outside we can never seem to find it. We even tried using the bird sound ...