There are two gorilla species, both with 2 sub species:
» eastern gorilla (Gorilla beringei)
- mountain gorilla (Gorilla beringei beringei)
- eastern lowland gorilla also called grauer gorilla (Gorilla beringei graueri)
» western gorilla (Gorilla gorilla)
- cross river gorilla (Gorilla gorilla diehli)
- western lowland gorilla (Gorilla gorilla gorilla)
If you see a gorilla in a zoo, it's the western lowland gorilla. Are you in Zoo Antwerp, then you'll also see one eastern lowland gorilla: Amahoro. She's the only eastern gorilla left living in zoos worldwide, after the other eastern lowland gorilla living there (Victoria, born on 9 June 1968 in Antwerp) died on 21 May 2016. Victoria died of old age on a respectable age.
All wild gorillas are listed as critically endangered on the IUCN Red List. This is (among others) because human beings are destroying their habitat for several reasons You can read about the different reasons here: gorillafoundation.nl/protection.
Everything on my website is about the western lowland gorilla, unless stated otherwise.