We are pretty sure the multi colored one is a rooster as it is trying to crow, chases the other chickens, flaps feathers as if to show off, and if you zoom in there is a little knob on the upper leg like a spur growing in. However I am confused about the black one (most likely a black astralorp). No knob anywhere but very bonded to an obvious hen (the brown one in the corner of the pictures). Doesn't make any noise really and just likes to jump out with the other one a lot. Didn't peck when picked up to clip the wings like the multi colored one did. The multi colored one was actually the only one that pecked and scratched, but calmed down after a few minutes of being held. They were raised together since 4 weeks and all are about 21 weeks old. We have one more obvious hen from the group we purchased as babies too. Please help me know if one or both are roosters.