and I start to have more problem. like the male one was really calmed and never be aggressive before even he keeps mating with the female for 2 weeks now. but now he just changed from really calmed and dashed out to peck on the female and tore of her feather with no reason, he didn't even want to get on her back. at first it's only once per 2 days or so. but today the male just chased and tore off the feather from the female 4 times today already. and I tried to separate them but they're calling to each other. I'm really afraid about stressed will build up from this. but without separating them, the male attacked the female sometimes and don't really know when it will happen. He also made some kind of "kakakakaka" noise while attacking every time. any best solution about this? I keep them as a pet, so I only have 2 quails.