The seas gental Giant.
"The whale shark is found in open waters of the tropical oceans and is rarely found in water below 22 °C (72 °F). Modeling suggests a lifespan of about 70 years, but measurements have proven difficult.[10] Whale sharks have very large mouths and are filter feeders, which is a feeding mode that occurs in only two other sharks, the megamouth shark and the basking shark. They feed almost exclusively on plankton and are not known to pose a threat to humans.
The species was distinguished in April 1828 after the harpooning of a 4.6 m (15 ft) specimen in Table Bay, South Africa. Andrew Smith, a military doctor associated with British troops stationed in Cape Town, described it the following year.[11] The name "whale shark" directly refers to the fish's size, being as large as some species of whales[12] and also that it is a filter feeder like baleen whales."
https://en.wikipedia.org/wiki/Whale_shark
Many people travel to see them and there are tours that allow you to swim with them.