Hello all, brand new here and fairly new to quail. I have 1 dozen quail. They are all Tibetan or Tuxedo coloration except one normal brown/wild type coloration. They are approximately 4 weeks old, though one appears to be a bit younger than the rest as he/she still has the yellow stripes by the eyes. (Chick feathers I mean) How old do they have to be before I will be able to determine gender? Any help would be greatly appreciated, thank you.