I’m trying to raise some baby blackbirds that have fallen out of their nest. The mom built the nest in the wall of my barn. The babies couldn’t stay in it, I’ve tried putting them back several times and they fall again. One died from the fall onto a concrete floor. I took the other three this morning. I’ve been feeding them every hour and they seem to be doing well. Every time I feed them I give them two hot water bottles. I’m worried about them getting too cold over night in the house with the AC on. They are nestled together in some straw on one side of the box with a hot water bottle on each side. Would it be ok to wrap a heating pad in a wash cloth and put it on the other side of the box, leaving it on a low setting overnight?