Mom Robin doesn’t need anything special in her diet to have blue eggs. "Robin's egg blue" comes from pigments in her blood. Hemoglobin from ruptured blood cells is transformed into "bile pigments," which are carried by the robin's blood to where the eggshell forms.
"I saw a robin nest with 3 bright blue eggs in it 4 feet up in a small fir tree on a tree farm." Axel T.l in Duvall, WA (April 16, 2014)
Photo: L. Birnbaum
