Species size information from:
Gibbs, J.P., F.A. Reid, and S.M. Melvin. 1992. Least Bittern. In The Birds of North America , No. 17 (A. Poole, P. Stettenheim, and F. Gill, Eds.). The Academy of Natural Sciences Philadelphia , PA , and The American Ornithologists’ Union , Washington , D.C. |