Once she found a squirrel, she set up the sound system and played the different recordings: the hawk followed by bird chatter, and the hawk followed by birdless background noise. She kept track of ...

“In the universe, an absolute vacuum is rare, and most of the universe is very low-density high-temperature plasma,” said ...

If you are interested in birds, you really have to be interested in birds songs — and really any kind of sounds birds make ... Their raucous chatter, along with their bold demeanor, make ...