We just got 6 little Buff Orpingtons this past Saturday, and they were three weeks old yesterday. The plan is to hopefully get three hens out of the group, and give the roosters to friends in the country. The lady we got them from said to look for crests growing on the tops of their heads, and the first ones to get crests would be the males - but when does that start to show up? Are there other indicators we can be watching for as well? TIA!