Hello, I have a birdhouse where I have been observing house wrens feeding their babies several times a day. It’s been very hot here the last couple of weeks, and as of yesterday, there are no active fledgelings observed in the nest. However, it seems as though the parents keep returning to the nest and going in and out. it almost seems as though they are starting to nest again as they are taking branches and string into the nest. Is it possible the babies died in the heat and are still in the box, why would the parents be returning to the nest so quickly and adding things to the nest?