that is definately a great white shark DD, not an orca. all aquatic mammals have a horizontal tail. all fish have vertical tails. that one is defintaly vertical. also, great whites are gray/black on top and white on the bottom. this is ts that they blend in. water from above looks very dark, and so anything viewing the shark from above would see the dark back and it would blend into the dark water. water from below looking up looks very light, so the white belly of the shark would blend in with the lighter water. that's why almost every aquatic creature is colored in such a way. dark backs, pale bellies