AdvertisementHigher-Tech Fake Eggs Offer Better Clues To Wild-Bird BehaviorMay 26, 2015Nell GreenfieldboycefacebookEmailOne 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)
