Jamie has a Wren that comes back year after year. This year he thinks it moved down to his new house. It set up a nest in Deb's new MC helmet that was hanging in the garage over winter. They waited till she left and very gently moved the whole nest out of the new helmet and into and old one. Hung back up in the same spot. Luckily no eggs at the time. When she came back in she settled into the nest with out a hitch.