I was dropping my friend off at her parents house and her dad came out and saw that I had some quail in the car. I was taking them to drop off at my FIL's house because he wants to raise them. Anyway we got to talking and he said that the heat during incubation determines the sex. He said if it's on the warm side or the cool side could mean you have more of one gender than the other. I was just wondering if there's any truth to this. It sounded far fetched to me but then again I don't really know anything about it? I just assumed that it was predetermined like with human babies. I didn't want to be rude and challenge him on the topic but now I'm really curious.