The organism present in high concentration in pigeon droppings is

The organism present in high concentration in pigeon droppings is Cryptococcus neoformans.
Cryptococcus is an environmental fungus found all around the world in soil and is usually associated with bird droppings. While soil contaminated with pigeon droppings is the major environmental source for C. neoformans, eucalyptus and other trees and decaying hollows in living trees are the major reservoir for C.