Many tropical bird species have restricted elevational distributions, potentially limited by how environmental conditions affect physiological processes. While some studies have examined adult ...

A cluster of microscopic fossil eggs unearthed in South Korea is reshaping what scientists know about early bird reproduction, offering the first physical evidence of avian eggs in the region during ...

Osteopontin (OPN), key protein found in avian eggshells, is likely responsible for the shells' structure at the smallest scale and corresponding mechanical properties, like how hard certain layers are ...

Egg cells need to store large amounts of proteins and other molecules to support the earliest stages of development. But how ...