Some are just more temperamental then others.When I bought them as babies and ever since I have been monitoring them, the seller told me that the black one and the white one at the back are females while the bronze white at the front is the male, but they seem to be behaving strange these days as the bronze at the front rerely displays while the black and white one at the back do normally displays and the two engages in bloody fights so I don't know what the fight is all about.
The black one has a larger snood then the white ones. So, he's obviously male. Another feature to look for is that females have a mohawk, & males have bald heads.