After visiting the Velciraptor holding pens, Ellie Sattler confirmed to the rest of the group that the dinosaurs had indeed attempted to attack them. Ian Malcolm then points out that large predators such as Lions and Tigers were not born Man Eaters, only becoming so after discovering humans were easy to kill. Malcolm then points out to the rest of the group that the Velociraptors are separated from man by Sixty-Five million years, which meant that the raptors shouldn’t have attacked them so quickly. Unknown to the rest of the group, this confirmed Malcolm’s hypothesis that the Velociraptors had indeed managed to escape, and proved the park was not as safe as initially represented.
Jurassic Park by Michael Crichton page 119-120 (First Edition, Thirty Fourth printing)