Neck feathers being plucked
I have 6 lovebirds in a large cage, 6ft x 61/2ft x2ft. Last peach face additions were two older females which mingle but do not really participate, they have their area. Have also built 8 nesting boxes in the cage at all times, many toys, tree branches, bird bath, swings, bells, cuttlebone, millet in holders, perches, hamster wheels - so they do have a variety to play and be at peace. The other two sets seemed mated. One set is a peach face and the other dutch blue. They chose each other. The males seem to get after the females by pulling out their neck feathers to a point only down remains and a few pin feathers which are red. They sit beside each other, sleep together, regurgitate with each other, groom each other, but the males pull these feathers and these only - nowhere else. This has been persistant for about 4 months. At wits end for their well being, do we seperate?