Lengthening initial incubation and optimizing egg warming in the hatchery can improve hatch and reduce embryo mortality.

BIG BEAR — A pair of bald eagles in a 120-foot-high nest that overlooks Big Bear Lake are patiently incubating two eggs laid this month, and the process toward hatching is playing out via a live video ...

Some tropical birds have longer egg incubation times than their temperate cousins, even though their habitat is teeming with egg-eating predators. The reason why has long been a mystery, but a new ...