Actors do move in herds. While they may not have captured the breathtaking spectacle of the original scene, it looks like serial pranksters Improv Everywhere had a lot of fun with this dinosaur-themed lark.
Asking for directions to Jurassic Park whilst driving one of the movie's iconic jeeps around New York City, the improv group then had a dinosaur rear out of the trees in Brooklyn's Prospect Park. In a much tamer version of some of the film's other classic scenes, the cast later had the dinosaur chase some children around the park. No limbs were lost. [Improv Everywhere via io9]