Yes, freshwater sharks do exist. In fact, there are many species of sharks that inhabit freshwater environments around the world. Some of the most common types of freshwater sharks include the bull shark, the blacktip shark, and the tawny shark. While they may not be as large as their saltwater counterparts, freshwater sharks can still reach sizes of up to 6 feet in length. One of the reasons why there are so many different species of freshwater sharks is because they are able to tolerate a wide range of environmental conditions. Some species live in cold, fast-moving rivers while others prefer warm, slow-moving waters near the coast. Freshwater sharks also vary in terms of their dietary habits. Some feed mainly on fish while others consume a variety of prey items including insects, crustaceans, and even small mammals.