Animal conservation project of a4trip aims to protect endangered animals and raise public awareness of these animals. But how to evaluate whether a specious is endangered or not?

The IUCN Red List of Threatened Species is a wide useful way to solve the question. First launched in 1963, IUCN Red List of Threatened Species has been recognized as world’s most effective way to assessment animals at risks. IUCN is currently managing data on approximately 41,500 species, with this number set to increase to well over 50,000, perhaps even 60,000, by 2008. IUCN will assess the status of those species in concern every five years.
Here is the chart for recent data release.

The Red list based on IUCN Red List Categories and Criteria provides taxonomic, conservation status and distribution information on taxa.

Extinct or Extinct in the Wild means specious cannot be evaluated because of insufficient information. Threatened divides into Critically Endangered, Endangered and Vulnerable. Specious have been evaluated to have a low risk of extinction are classified as Near Threatened, Least Concern.