One of our "girls" is a bit bigger than the rest and makes a weird sound that none of the other 3 make - could she be a he ? It does sound very like a junior rooster crowing but my chicks are only ~ 3 weeks old. Is it too early to tell ? Every time I put my hand in their brooder to take out feeders, clean poop away etc., all 4 chicks come running and they have started to peck / nip at my hands. We have never fed them food by hand so I'm not sure if this is just 3 week old behavior but they really can bite ! Any advice on how to stop this ? Our chicks, at 3 weeks, are doing an awful lot of flapping around and can get to the top of their brooder box now (we have a window screen covering it to keep them in the box). At what age should one do the wing clipping ? Thanks !