Species conservation
According to the criteria suggested by the IUCN (BAILLIE & GROOMBRIDGE 1996), the following categories of organisms are distinguished in the commentaries to the individual species:
EX |
extinct or exterminated (not a single individual surviving) |
CR |
critically endangered (by extinction in nearest future) |
EN |
endangered (a taxon exposed to a high risk of extinction) |
VU |
vulnerable (increasing imperilment) |