The largest living species of fish is the whale shark (Rhincodon typus). These gentle giants can grow up to 40 feet (12 meters) or more in length, with some reports claiming individuals may reach up to 60 feet. Whale sharks are filter feeders, primarily consuming plankton, small fish, and other tiny organisms by filtering water through their gills as they swim. They inhabit warm waters across the globe, often found in tropical oceans where food sources are abundant. Despite their massive size, whale sharks pose no threat to humans and are known for their docile nature and occasional interactions with divers.