They are constructed of grass, bark, cobwebs, and other shrubland debris.
en.wikipedia.org Using bits of cobwebs, bark, and lichen, the female bee hummingbird builds a cup-shaped nest that is only about 2.5 cm (1 inch) in diameter.
en.wikipedia.org The scheme took the practical form of cleaning doors and windows, removing dirt, dust and cobwebs, whitewashing, painting, and simple repairs.
en.wikipedia.org It builds its cup-shaped nest made up of fine grass and rootlets matted with moss and cobwebs.
en.wikipedia.org They may appear as spots, threads, or fragments of cobwebs, which float slowly before the observers eyes.
en.wikipedia.org