The killer whale, also referred to as the orca whale or orca, and less commonly as the blackfish, is a toothed whale belonging to the oceanic dolphin family. Wikipedia - Stop the Dolphin and Orca Slaughter NOW
PEEK A BOO Orca Whales, Photograph by David Attenborough. Spy hopping - A form of cetacean behavior that consists of rising vertically out of the water, head first, and scanning the entire surrounding area while rotating.
Rainbow pictures can be experimented hugely. It is not just nature creating a rainbow but artificial rainbow pictures too can be captured. here are some ideas and inspire you to create some of your own.