It all starts with a young boy who had terrible parents. These terrible parents never let him watch Jurassic Park or any of the sequels. Little Jimmy goes to college and becomes Earth's most amazing geneticist. All the while, he never learned one the most important rules of life: Never ever bring dinosaurs, especially the carnivores, back to life.
Before everyone else has finally been able to make Sharktopus a reality, Jimmy has bought an island in the Pacific and turns it into a massive zoo. Then, he invites some people to the zoo for a beta testing. Those people all die because the raptors figure how to get out of their holding areas. Raptors, being the clever creatures they are, start teaching themselves important skills. How to open doors, set traps, talk, and fly the helicopters. Next thing you know, they're headed to the mainland.
Chances are they've also learned how to steer boats. It'll be an aerial and sea attack. Eventually, after a long and harsh battle, velociraptors will become our overlords. We'll be slaves, pets, and food. Raptors also have a thing for the Victorian Era. Top hats and monocles will be back in fashion.
We'll stay under the rule of our velociraptor masters until the dolphins have gotten fed up with not getting free fish or lots of cheers for jumping through rings. They'll learn how to build lasers, rise up, and free us from slavery. Vive la Revolucion!
Disclaimer: I do not and have never owned anything related to Jurassic Park.