Ithaca, NY, USA
Each year for four or five years we had a pair of Robins build a nest on an old sled which is mounted over the door to our shed. We assume it was the same returning pair. Last year the nest went empty. This year a pair of Robins have returned. We are uncertain if it is the same original pair, descendants of the originals, or simply a new pair moving into the old homesite. Each year the nest gets added to it and becomes taller and taller.