The Big One

The Big One is the true main antagonist of the first Jurassic Park film. She is the leader of the Utahraptor pack featured in the film.

Trivia

 * The Big One and her pack are Utahraptors, because Utahraptors we're as tall as humans, Deinonychuses were half as tall, and Velociraptors were only as big as a rooster. Plus, Megaraptors didn't sickle-shaped claws and were almost twice as tall.
 * Scientists have proven that Utahraptors were only as big as a chicken, which would mean that the raptors in the Jurassic Park franchise are indeed Utahraptors.
 * Fans are constantly speculating that the raptors in this film are Velociraptors, but they aren't due to the Velociraptor's real size.