In Hungry Shark Evolution you're a big shark that swims around an ocean, trying to eat anything and everything that comes into your line of sight.
People have captured videos of themselves doing exactly this via the Everyplay functionality the developer has included, and from these videos I've determined the 8 most dangerous creatures that swim its seas.
Titanically Large Shark eats whole boats
Shark With A Jetpack doesn't even need you to go back in the water
Shark With A Jetpack And A Monocle is such a sir that he'll eat Santa and get away with it
Rebel Shark just will not play by the rules, man
Robot Shark completely ignores Asimov's rules of robotics
Sweary And Loud Shark is sweary and loud (and NSFW)
Ice Breathing Shark is like Superman, only not a superhero but a shark
Shark With Laser Beam On Head has got bad ideas from the Austin Powers movies
Found a more dangerous shark? Drop me a link in the comments.