help id breed

I found this single egg inside a fairly large chicken coop with no other types of birds inside. it is a enclosed coop, so the only kinds of birds EVER inside are miscellaneous breeds of chickens and black birds that are able to fly in. They look like the kind of birds that hang out in like...

Hi! So, I’m still relatively new to BYC. My broody is on her second clutch, and I have successfully raised the 1 surviving chick from her 1st clutch with 5 out of the 6 chicks that I bought from tractor supply to keep the one chick company. But, now I’m curious as to what breeds they all are...