Nessie is mistaken for many animals, like elephants, seals, sea lions, pin-nosed dolphins, and regular dolphins, but with almost every theory, there is something that doesn’t fit. A lot of people and scientists have only seen seals, turtles and shadows. There is one theory that fits best. That is a dinosaur that may have stayed in the cool waters and survived, while all the other dinosaurs died off over 65 million years ago. Nessie probably is some sort of dinosaur that lived in the waters for its entire life.