One of these things is not like the other: A 3-D printed model of a beige cowbird egg stands out from its robin's egg nest mates, though their shape and heft are similar. Ana Lopez/Courtesy of Mark Hauber hide caption

toggle caption Ana Lopez/Courtesy of Mark Hauber
Higher-Tech Fake Eggs Offer Better Clues To Wild-Bird Behavior
  • Download
  • <iframe src="https://www.npr.org/player/embed/409730987/409804767" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript