Feathers evolved in dinosaurs and are a key characteristic of birds today. They are arranged in a precise hexagonal pattern in a bird's skin, but it has been unclear how this happens. According to a ...
Vanya, curator of birds and mammals at the Cornell University Museum of Vertebrates, studies a turkey vulture wing at the Cornell Lab of Ornithology. — Photos: BRYAN ANSELM/The New York Times Vanya ...
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