There are certain breeds of heritage birds that do produce a darker yolk, particularly the Copper Marans hen, which has long been prized ... something different. I've heard that in England, their ...

Those eggs had thick, rich, brightly colored yolks from active, earth-roaming birds with far lower stress levels, birds who felt the breeze and the sun, who scratched up snack worms, who were fed ...

The result was “mandarin orange peel, or maybe even blood-orange red,” says Rathgeber. “They were quite dramatic.” Rathgeber gave the first dozen eggs to a friend for feedback.

Bird eggs laid in cold climates are darker, which may keep eggs warm. A global survey of bird egg color reveals a simple trend: the colder the climate, the darker the egg.

It was nature’s version of an Easter egg hunt. Dr. Claire Spottiswoode, a professor at the University of Cape Town who studies avian (bird) brood parasites, was working in Zambia to learn more ...