Someone PMed me a few days ago about how to vent sex coturnix chicks...and I promised to help them. HOwever,being the dumby I am, I somehow deleted their pm and dont remember the screen name! SO if YOU read this please let me know you saw it so i dont feel so bad! LOL! First to see on a slightly bigger vented bird, is an over a week old marans chick Cockerel: Marans x orpington pullet(this picture was reported on photobucket as offensive...lol....but i uploadedit to byc....i see educational not offensive it's a bird butt what gives? LOL): And heres very young coturnix chicks, youngest is under a week old. Be forwarned, you CAN injure chicks doing this. I have yet to hurt any but I vent sex quickly, and if I cant tell within the first few tries I put them back and leave them alone for a few more days. This is a cockerel coturnix chick, still a down puffy chick: And heres two pullets: Cockerels will have a shiney almost circular bump in their vent, hens will not. Hens will have just pretty much an empty void. YOu MAY get pooed on vent sexing, and the easiest way i've found to avoid this is choose the chick you just saw poopie then you'll know they're clean for a few moments atleast Or if you've seen how they do it on the "dirtest jobs" eppisode you can do that too. I've tried both ways, and I think the cleanest way is waiting for them to poo naturally lol. Heres a chart I made up... #1's are the vent barely opened, #2's are the vents opened up without harming the chick to get the best look. I don't reccomend opening up a very small coturnix chicks vent they are so tiny youcould do internal damage.