Earthwatch team 6 carried out from October 9 to 17, 2004 at Tam Dao National Park. There were three volunteers, of which two from USA and the other from Spain, and three Vietnamese people: Anh, Lien (PI) and Viet . The weather was good with sunny and dry, without rain for few weeks. We rocorded 82 butterfly species and 1570 individuals along transects.