Do Southern Stingrays also leap?

I understand that the leaping is also a purely defensive measure - that they are usually trying to escape a persuing predator. Sharks, for instance, prey on stingrays.

Since the waters where the stingray swim take place are crystal clear, I would think you would actually see any prediators that came into the area... I haven't seen any in the several times I've done this. That doesn't mean they couldn't be nearby.

Wonder if the boats, humans, and 'swarm' of rays may discourage predators from actually entering the area?

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