Lesser Noddies (Anous tenuirostris), make their nest using leaves and their own guano (fancy word for poop). Waste not, want not?

[Photo by Nick Chudeau in Cousin Island, Seychelles; Caption by Karli Chudeau]

Reference

Surman, C., Burbidge, A., & Fitzhardinge, J. (2016). Long-term population trends in the vulnerable Lesser Noddy Anous tenuirostris melanops at the Houtman Abrolhos, Western Australia. Corella, 40(3), 69-75.