Formal:
* Band: This is the most common and generally accepted collective noun for gorillas.
* Troop: This term is often used as well, particularly for gorillas in the wild.
Informal:
* Herd: This term is less common but can be used.
* Family: Gorillas live in social groups with a dominant male, females, and their young.
* Congregation: A more poetic or formal option.
Ultimately, the best collective noun for gorillas depends on the context and your personal preference.