Black chick

[ArkAvian]

I hatched a totally black chick. The mother a cross between a halfbreed Leghorn hen and Cornish cross roo. The father could be the brother from the same batch or it could be her own father OR a RIR looking roo I reverse bred from the red sex link chicks. I will upload more pics tomorrow. I need help in identifying really what I have combined from so many crosses. Only one black chick survived the rest died because the eggs were all double yolked. Also is that normal? The hen only lays a single yolk rarely all others are double yolked is this strange?

 

[ArkAvian]

I will upload proper pics tomorrow

 

[Abby125]

Did the hen start laying this year?
If so hens that just started laying usually lay double yolk as for the
Chick I don’t know you just have a mix baby it is cute hope someone else can help more with the chick