| Sumario: | Globally threatened species, the current status, how Little is known, the number of described species and the number evaluated, how many threatened animal species are there, threatened vertebrates; extinction in recent time, current extinctions, extent species that survive ex situ, what is the rate of extinction, which taxonomic groups are most prone to extinction, where have extinctions occurred; trended in the status of threatened species, red list indices of birds, 198-2004, the red list index for all birds, the red list index for birds and ecosystem, geography of the red list, mapping species to predetermined geographic units, countries, ecological systems, biogeographic realms; the many causes of threat, habitat destruction and degradation, over-exploitation, invasive alien species disease, pollution and contaminants; the social and economic context of the red list, human population, current population density, population growth, economic factors; conservation response, research, action, communication and education, policy, based actions; conclusions, the IUCN red list and the 2010 target, how is the state of biodiversity changing, which species are in trouble, where is the threat of extinction greatest, geopolitical units, ecological systems.
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