I have a blue jay nest in my yard. One baby was on ground yesterday. Another on ground today. I went out to check and the one from yesterday is dead. No marks. I don't think the mother was feeding it. I feel horrible. Looked around the yard - found the other one quite a ways away from where it started. There are two more in the nest. They have all their feathers. I didn't try to put the little guy back in his nest yesterday because I thought he was ready! I am devestated he didn't make it. The other one looks strong, but I don't know if a night away from the rest of them will kill him too! The parents are around and protective. I just haven't witnessed them feeding on the ground.