I have some interesting Marans photos of chicks I hatched from Crunchie. When they first hatched, I had one very dark chick with a well defined white spot. The other two looked a lot alike and were lighter. But within a few days, it became clear that all three chicks looked very differnet. I have taken photos at two weeks and focused on wing feather development.
They are arranged darkest to lightest in this photo. Chick #1,2, and 3
In this photo, they are arranged as chick 1, 3, 2 with the lightest in the middle. Notice the difference in wing delvelopment
This is my darkest chick, lots of wing development, clear white head spot, not much lacing on the wings. May be an unusually dark female
Here is chick number 2 from first photo: very dark head but more grey....advanced wing development and pretty lacing.
Here is the lightest chick, #3 in first photo with very little feather development compared to other two chicks.
I will post the final verdict when they make their genders clear but I think # 1 and 2 are pullets and #3 is a cockerel. Hope this helps others with the same breed.