A listener responded to our invitation to send recordings of backyard wildlife with audio of a spooky bird screech. An expert at the Cornell Lab of Ornithology helped solve the mystery. OK, that's not ...

And let's take a moment to listen to the sounds of your backyard, or one like yours. OK, that's not actually a bird whistling reveille. But when we invited people to send us sounds of nature, we heard ...

OK, that's not actually a bird whistling reveille. But when we invited people to send us sounds of nature, we heard sounds that were distinctive enough. [POST-BROADCAST CORRECTION: In the audio of ...