GELLERMAN: We leave you this week in a Brazilian coastal forest.

GELLERMAN: Brazil's Atlantic Forest is one of the richest and most diverse ecosystems in the world. It’s also among the most threatened. Once a vast half million square miles - it's now been reduced 90%. The loss of the forest habitat threatens the home of the endangered northern muriqui, or woolly spider monkey. Douglas Quin recorded these sounds at the Caratinga Biological Station in Brazil's Atlantic Forest. This is from his CD Caratinga.