The problem of possibly encountering wild animals has previously been mentioned in the context of hazards, but was more or less discarded in favour of animal_crossing: Talk:Key:hazard - OpenStreetMap Wiki
As I mentioned there, we have signs warning of crocodiles in the water, and also sharks and stingers / jellyfish.
What would be the best way of tagging them? hazard=marine_creatures?
In addition, there are also signs warning of submerged rocks, strong currents etc. What would they be, or would just that hazard=submerged_rocks be sufficient?
Risks from sharks are quite different from those from jellyfish, but does one then get into an infinite list of hazards? Is a text-based explanation more appropriate?