Bird guano contains

Guano is the accumulated excrement of sea birds and bats. It is a highly effective fertilizer due to its exceptionally high content of nitrogen, phosphate and potassium.
Bird guano has high levels of nutrients like nitrate and ammonium.
It contains about 11 - 14% P₂O₅, 8 - 21% nitrogen, 10% protein, 7% ammonia and 0.5% nitrate.