What really did come first--the chicken or the egg? Birds' reproductive biology is dramatically different from that of any other living vertebrates, and ornithologists and paleontologists have long ...

Eggshell colouration plays a vital role in avian reproductive strategies by influencing both the thermoregulatory properties and the structural integrity of eggs. Recent studies indicate that ...

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 ...