Birdhouse with roof 3D model is available on CGTrader for $50. Original author: Plutonius3d. Specs: 7016 polys, 3562 verts.
STL (Stereolithography, filesize: 4.12 MB), OBJ (OBJ, filesize: 8.64 MB), C4D (Cinema 4D, filesize: 4.2 MB), MAX (Autodesk 3ds Max, filesize: 4.21 MB), OTHER (Other, filesize: 4.23 MB), 3DS (3D Studio, filesize: 4.09 MB), FBX (Autodesk FBX, filesize: 5.85 MB), UNITYPACKAGE (Unity 3D, filesize: 5.85 MB)