I this challenge all of your nichelings MUST have a peacock tail. If there is a nicheling without, they must be killed. You must only have one male per group/flock, if you wish to have another male, both males must fight. One either dies or gets chased away. The male with the higher attack or  call will win, you may randomize if the other male gets killed and you may also randomize if they have the same highest stat.  In this challenge, inbreeding will have to exist, so it will help if