In Jurassic Park (1993), Muldoon has this to say about the velociraptors when he first meets Dr. Grant (emphasis mine):
They're extremely intelligent, even problem-solving intelligent, especially the big one.
The way he describes her it makes her sound like she is the leader of the pack.
When the raptors escape, we only ever see two at a time, and to my eyes they looked to be about the same size. I would have expected that since they made a point of mentioning that one raptor was scarier than the others that she would become a key player in the raptor scenes. Do we ever actually see "the big one", and if so, do we know which raptor she was?