lunedì 4 aprile 2016

NYT Science: Before Eagles Fly, They Must Hatch

Before Eagles Fly, They Must Hatch
By C. CLAIBORNE RAY

When do hatching eaglets start to breathe? Is there air in the egg before they energetically work their way out?

Published: April 5, 2016 at 06:00AM

via NYT Science http://ift.tt/1qkmtJY