My personal opinion... The Barred Rock is a cockerel, the Ameraucana is a pullet. I couldn't say about the Wyandotte. You can start checking for saddle feathers; they will be long and pointed for cocks and fat and rounded for pullets.
Ok thanks, was hard to get pics We are moving them to coop tomorrow and they are getting cramped in current box, so they were getting feisty while I was there trying to inspect them and take pics. Still figuring out the other breeds we have. If only silkie sexing was easy...
Boo on roo. Sigh. Guess we need to find it a home.
Barred rock looks like a pullet to me. She has dark black barring not grayish like a male. She also have a black wash over her legs - another pullet trait, and her comb is not large for her breed.