Something that makes you go huh?

by Pam P
(Castle Hayne, NC)

I've been observing a pair of nesting bluebirds and I was curious as to why they do this. I've noticed and observed their behavior while feeding their nestlings. Why do they always get food in beak, fly to branch in tree, look around for a few and then fly to nest box, perch on top of that for a few seconds looking around again, and then go inside. I understand they're probably being cautious but when they are perched on top of box with food hanging out of their beak instead of flying from tree and going straight into box, isn't that just drawing more attention to themselves and attracting even more of a chance for predators?