gwah'no, a valuable manure, consisting of the decomposed excrement of sea birds. The largest deposits of guano were formerly on the Chincha Islands off the coast of Peru, but these have been entirely exhausted. Smaller deposits are found on neighboring islands, and Peru is still the chief source of supply. Previous to the Civil War guano was extensively used as a fertilizer, but it has now been almost entirely replaced by cheaper materials. Guano made from menhaden is called fish guano, and that made from blood is called blood guano. See FERTILIZERS; MENHADEN.