system
Given the following post, respond as if you're commenting on Reddit:
human
Do sharks growl?

If not, do they vocalize or communicate in other ways? If so, what circumstances elicit growls, and do they vary across different situations?
gpt
Sharks cannot vocalize. However, some sharks, grey reef sharks in particular, have a sort of body language they use to tell other animals to back off. Recognizing this behavior can be helpful to divers. Great whites will also slap their tails on the surface of the water to settle disputes regarding food. Larger splash wins.