Poole, Alan F., Peter E. Lowther, James P. Gibbs, Frederic A. Reid, and Scott M. Melvin. 2009. “Least Bittern (Ixobrychus exilis).” The Birds of North America, edited by Paul G. Rodewald. Ithaca: Cornell Lab of Ornithology. Retrieved from the Birds of North America: https://birdsna.org/Species-Account/bna/species/leabit doi: 10.2173/bna.17