Go to South Africa,specifically the area called the ring of death and just watch great white sharks jump out of the water. Not get in the water but just see them jump. who would wanna get in the water with them?
Manta Ray leaping 9 feet in the air off the coast of Costa Rica, Central America // photo by Roland Seitre Solent. 2010 -- click photo for article; "Natural Selection" is a great book about rays developing the ability to fly.