Bats and humans

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.

experimental World War II weapon in which bats carried incendiary devices

device used to detect the presence of bats

road construction to aid the navigation of bats