A robin lays three to five bluish green or sky blue eggs. The eggs are approximately 1.2″ x 0.8″. Helpless, naked chicks with sparse white down hatch after 12 to 14 days and spend about 13 days in the nest before fledging. Three broods per year are not uncommon. I found this egg on the ground near our house (Modoc County CA) last season. The nest in the tree above the egg had four young robins. I assume this egg was either infertile or had fallen out of the nest days earlier.