Hi, I'm going to get a few Chukar partridges for a friend of mine and he said he wanted a few males. If theirs a bump on the backside of its legs does that mean it is a male and at what age do Chukars, if its a male start developing that bump on its legs? Last time I was looking at the legs and all of the Chukars had no bump unless their were all too young to get the bump. Thank You!!