Sharks

Shark gods in Hawaii come in two kinds. There are benevolent one that dont eat human meat, and malevolent ones that eat people. There is one particularly interesting story about a good (non-people eating) Shark god who fell in love with a beautiful girl, had a child with her (in his human form) and in a strange twist the son was born a lovely baby except for the shark mouth on his back. The father warned that the child must never eat meat, or he would grow up eating people. Sure enough the grandfather of the child decided that this was unecessary and feeds him meat. The story unfolds with the evil shark-boy getting killed by a young god from Maui. Moral: do not, ever, feed your shark babies meat, else they will turn evil and die a horrible death.