Brown and white are not the only colors chicken eggs come in. Some chickens have been known to lay eggs that feature biliverdin in them, turning them what color?

Biliverdin is the same pigment found in Robin eggshells, which have that distinctive blue hue. In chickens, a blue-colored egg suggests that the chicken that laid it has a virus. The virus changes the chemistry of the eggshell so that it can absorb biliverdin from the chicken's uterus.

Asked by Tom Cohen · Last updated 5 years ago · 1.8K views