Meet the gentle giant of the Sea of Cortes, the whale shark. Truly whales—not sharks—whale sharks, the largest fish in the planet, can weigh up to 15 tons and stretch 40 feet long. That’s as heavy as the anchor of a ship and as long as a school bus. On a similar scale, whale sharks have 3,000 teeth, but they don’t use them to bite or chew. They just open their huge (five feet wide!) mouths to eat whatever plankton, squid, krill, and small fish cross their path. Good thing they don’t have to exert too much effort to feed, whale sharks are slow swimmers, topping out at three miles per hour.