My birdhouses will have a variety of nest types in them, from the fine grass swirls of the bluebirds, a very messy grass and feathers nest of the sparrows, sticks the wrens uses, grass and trash (like candy wrappers) of the tree swallows and the a very soft moss nest of the chickadees. This chickadee was collecting nesting material from the side of the tree.
Chickadee Collecting Moss