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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 ...

Climate change has now become one of the biggest threats to ecosystems globally, as global cycles that have helped species thrive for centuries have shifted. Birds in particular, for their elaborate ...

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 ...

Typically considered exceedingly rare in birds, a new study in Australia found sex reversal rates up to 6 percent for some avian species.

We possess limited understanding of how speciation unfolds in the most species-rich region of the planet—the Amazon basin. Hybrid zones provide valuable information on the evolution of reproductive ...

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.

1 The relationship between short-term reproductive costs (indicated by changes in body mass, body condition and daily energy expenditure) and brood provisioning rates is explored using simple models ...