I've tried so hard to get pics and they're just too tiny. I'm hoping to put together a photo chart though this summer, since I'm hoping to hatch a number of quail chicks and ducklings, and have a better camera and helper now.
Yes, they're just so tiny. Unfortunately it's hard to get pics too because of that.
It's hard to explain unless you know what you're looking at. The males have a tiny, shiny, black dot when their vent is gently pulled on, and the females don't.
I find it easiest to sort the definite males into a tub, put the questionable ones in a tub, and put the females in a tub. I then band each group with a tiny rubber poultry band, which I change out for a bigger one every couple weeks. That way I know if I was correct when they mature.
I try to sex each questionable one again a few times and make a decision. I add a pink or blue band to their other leg and leave on the white question one. That way I know those are birds I guessed on. I've had nearly 100% accuracy out of probably 30+ quail chicks.