Stingrays have a unique ability to taste ammonia in the water. This allows them to find food in murky water and also helps them to avoid predators. The ammonia receptors are located on the rays' barb, which is the sharp pointy part of their tail. That's because they're really salty. Stingrays love the water and will usually just float around, but it is possible to spot them somewhere else splashing around or feeding on algae.