Our expert says:
The International Union for the Conservation of Nature (IUCN) defines these as follows:
"Endangered" is a sub-category of "threatened".
Threatened species are those about which there is concern, to a greater or lesser extent, for their future survival. There are 3 categories of threatened species:
1.Critically endangered. Extremely high risk of extinction in near future. e.g. Mountain gorilla
2.Endangered. Very high risk of extinction in near future. e.g. Blue whale
3.Vulnerable. High risk of extinction in the medium-term. e.g. Cheetah.
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