Poultry manure or guano (in English) or seagull manure, in geology, refers to phosphate deposits caused by the feces of seabirds, bats and seagulls, and it is an expensive material with a high level of phosphorus and nitrogen, which is called as Kudo is used as one of the construction components. Guano is a very strong fertilizer. Its constituent elements are ammonia, auric acid, phosphoric acid, oxalic acid, carbonic acid, as well as earth salts and impurities.