The short answer to this question is humans. Poaching and deforestation are the biggest problems that gorillas face in the wild. Other than humans, gorillas have very few natural predators.
Your sister
The biggest great ape is the eastern gorilla, which includes the eastern lowland gorilla and the mountain gorilla. They can weigh up to 440 pounds and stand up to 6 feet tall.
Gorilla
Jellyfish are eaten by squid. I believe that this is the biggest threat that they face.
Men shoot Gorillas , men destroy habitat of Gorilla .
Gorilla
the market economy was the single biggest threat
Churchill thought that Hitler was the biggest threat in WW2
Biggest threat is a landowner with a 22 rifle or 12ga shotgun.
you are
The biggest primate in the world is the Eastern Gorilla (Gorilla beringei). It can weigh over 400 pounds and stand up to around 6 feet tall.
The biggest gorilla is named Detective Yetti standing at 7ft. 8in. 545lbs. It is said to roam the jungle and eat crap.