Animal waste products

300px|thumb|The nest of the Peruvian booby is made of almost pure guano. thumb|Human-made Bird Island (Namibia)|Guano Island near [[Walvis Bay in Namibia]] Guano (Spanish from ) is the accumulated excrement of seabirds or bats. Guano is a highly effective fertiliser due to the high content of nitrogen, phosphate, and potassium, all key nutrients essential for plant growth. Guano was also, to a lesser extent, sought for the production of gunpowder and other explosive materials.

human bodily waste which is excreted from the body, such as feces and urine

Hyraceum () is the petrified and rock-like excrement composed of both urine and feces of the rock hyrax (Procavia capensis) and closely related species.