I have a 3x6' cage in the house where we've been keeping our favorite rabbits. I have my blue buck in one portion and Twix with her 2 kits in the other. The kits are ready to be weaned and Twix is due to have more in 2 weeks. Our temps are between high 20s F at night and 40F during the day. There's a huge pile of straw in the colony. Could I move the 2 kits outside or will it be too cold?