Parque Nacional do Itatiaia
Itatiaia is a famous city in the south of Rio de Janeiro state. There was created the first brazilian national park (the Itatiaia's National Park) to protect the Mata Atlântica. On the stamp that celebrate the park we can see its symbols: the squirrel, the plants and the Itatiaia's peak.
Mais/more info: http://www.correios.com.br/selos/selos_postais/selos_2006/selos2006_09.cfm