Can you identify these chicky babies?

[modimp]

My son hatched chicken in his Environmental Science class and we adopted two. Unsure of breed or sex. I am attached to them, but one of them seemed to make crowing noises this morning. Now I am concerned.

 

[Chicken Girl1]

Looks like a hatchery RIR and a Black Australorp, could you get better picture for gender guessing? How old?

 

[elizabethjg]

Tail pics?

 

[Gray Farms]

I'd say both boys if they're under 10 weeks.