This is a set of 3 stamps: the Front, Side, and Roof. A complete Bird Cottage will need all three. If you want to make a Bird Cottage card, you only need the Front and a Roof. You can use the Side stamp for backgrounds in cards, and the bird makes for a lovely addition as well!
The Small Roof is coupled with only the Ornament Cottage size, while the Large Roof fits on the rest.
The Small Bird is coupled with the Ornament Cottage. The Medium Bird is paired with both Small and Medium Cottages. The Large Bird is used with the Large Cottage.