Yeah I totally see it it's kind of like the males beaks head upwards in the centre and the females turn slightly downwards. It's very slight. But now that I see it I'm going to see if it's true for these guys and my newest batch when they finally hatch.
Honestly I'm horrible at it. So no lol no quaking or anything like that yet. I'll be looking at tail feathers later (So cute when they start growing in) I'm hoping of course for one male, two females but I generally have bad luck sooooo let's guess 3 drakes haha