My Marans chicks hatched on June 17, 2014, and they finally began laying this week. The first egg was on January 14, 2015, 211 days later. It was a double yolk, and was not very dark. The second egg came yesterday, and was a single yolk, and much darker. Both eggs are shown in the first picture below, along with a RIR egg laid this morning. The second photo shows the double yolker cracked in a bowl, and the third photo shows it just before it mysteriously disappeared.