The red dung great wealth in the north of the desert of Chile ( south America) it is explained by the abundance of fish in the cold current month of Humboldt, which are fed by the million birds. Great importance also has the extreme dryness of the coast of the desert; this non single prevents that the guano is washed quickly in rains, but also protects to the birds against its enemies, which could bother them during the time they are incubating; neither the terrestrial animals, nor the primitive man could have existed in the coasts of the north due to the lack of fresh water.
In the coasts of the Chilean North, in the desert of Atacama, is located one of the most arid zones of the world. Their little precipitations have produced favorable condition for the accumulation of Guano.
In this zone and during thousands of years one of the greater concentrations of birds was produced such as: The Guanay, The Piquero (Sulavariegata) and the Pelicano (Pelacanus Occidentalis Thagus) those that produced an important amount of guano in different zones.
This Red guano is formed by the excrement of seabirds, its antiquity goes back easily over the 400,000 years ago so it is fossilized, and it appears in different forms like mountain stream, mantles and small bays, its components vary from a place to another, even within the same place.