Researchers present a "Red List" of animal species which are threatened with extinction, at the International Union for Conservation of Nature (IUCN) World Conservation Congress in Barcelona October 6, 2008. A quarter of the world's mammals are threatened with extinction, an international survey showed on Monday, and the destruction of habitats and hunting are the major causes. From L- R: Head of IUCN Species Programme Jane Smart, Programme Coordinator of the IUCN/CI Global Mammal Assessment Jan Schipper, Chair of IUCN/SSC Biodiversity Assessment Simon Stuart, Conservation Programme Director for Zoological Society of London Jonathan Baillie, Chair of IUCN Species Survival Commission Holly Dublin. REUTERS/Albert Gea (SPAIN)