Blue Ocean Organics Peruvian Seabird Guano 12-12-2.5 55LBFertilizer for sustainable organic farming The ancient Incas of the Peruvian Andes are known for their advanced agricultural skills and ingenuity. Among their many discoveries was the value of seabird guano, derived from the droppings of fish eating birds off the coast of Peru. This guano made an excellent fertilizer that kept their soil rich and fertile. So precious was this fertilizer to the Incas that killing even a single guano producing bird was