I’ve seen a couple of stingray injuries in my travels over the years. They can be pretty nasty. I once did a sea kayaking trip of the coast of Belize and the support boat driver got stung in the ankle while checking the moorings of the boat one night. He was out of commission for about three days, unable to walk and having really bad flu-like symptoms.
Read about how to treat these stings in the field if you travel in areas near the ocean.