Ours makes you buy 3 and I surely don't have room for 3 more. Rural king makes you buy 2 and I don't want 3 in the house at the same, two is my limit for the mess and smell since they will be in here for 6 weeks. The brooder is open all the way at one end and they still stay near the heated end. It has a 75 watt red light for heat so I don't think she is too hot.Well, seems sad and heartbreaking for the duckling left behind. If you just want two you could look at the local feed stores or Tractor supply now for an additional healthy duckling so it doesn't have to rely on a fake friend.