At one point in the not-too-distant past, winter’s lack of birds completely flummoxed some of history’s greatest thinkers. Just a few hundred years ago philosophers posited that birds buried ...

Yanco explained that making the move could also have some reproductive benefits, even if it has no energetic advantage. "They may be using the energy savings from thermoregulation for reproduction.

But we will also hear why Trump’s new migration policies mean that this incredible story wouldn’t be possible today. Hanaa Rahimi: Former Afghan policewoman sharing her story under alias .

We’ve lost almost 3 billion birds in the U.S. and Canada since 1970 We’ve lost almost 3 billion birds in the U.S. and Canada since 1970 By Ula Chrobak Why do so many diseases come from bats?

"The energy modeling we did in the study predicted that migration should definitely create an energy surplus because of the substantially reduced cost of keeping warm in milder climates." ...