LOL! They can be such noisy little midnight munchers, can't they. First chick I had like that, I saw his crop and panicked. "OMG it's impacted!" I thought he was dying or something. I wouldn't worry about yours, I doubt they could ALL be roos. Piglets yes, roos, no. If Steffpeck can sex them by wing feathering, you should go with that opinion. I could never figure out the difference but I know some people can do it quite accurately at a couple of days old...