Miguel Castelino began leading nature tours in 1991 and is one of the founders and co-owners of Trogon Tours. He worked in Iguazú as a National Park Guard and Chief Naturalist for 6 years, where he achieved an impressive understanding of both flora and fauna of subtropical rainforests. As a naturalist, Miguel has focused on bird song identification and has recorded birds of Argentina and Southern Brazil for almost 20 years and has also made major contributions to nature conservation and education. He has also worked in Guyana on bird populations monitoring for the Kansas Museum and is also co-author of the Inventory to the Birds of Iguazú National Park. His solid knowledge of Brazil's Pantanal and the subtropical rainforests of northern Argentina led to a number of important discoveries, including the location of one of the most visited nests of Harpy Eagle in southern Brazil.