Fossil by fossil, paleontologists have traced birds back to their dinosaur ancestors. As they’ve done so, traits once thought to be distinct characteristics of avians – such as feathers and air sacs – ...
As winged dinosaurs underwent a series of evolutionary changes during the transition into Aves, or birds, one pivotal transformation was the appearance of a single-ovary reproductive system. "The most ...
CHAMPAIGN, Ill. — A new study reported in the Proceedings of the National Academy of Sciences assessed changes in the reproductive output of 104 bird species around the world between 1970 and 2019.
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