Jurassic Park III dinosaur-bird connection, said the feathers quills added to the "Velociraptor" for "Jurassic Park III" "looked like a roadrunner's toupee", but conceded that feathers are difficult subjects for computer animation and speculated that "Jurassic Park IV"'s raptors would have more realistic with plumage. In 2002, Crichton said he had not watched the film. A teaser trailer was released online in September 2000. Universal avoided excessive early marketing to prevent a possible backlash; the studio believed awareness of the film was already sufficient. Marketing began in April 2001, three months before the film's release. The first footage from the film was aired
Jurassic Park III portrayed differently in this film than in previous ones. Discoveries suggesting "Velociraptor" were feathered prompted the addition of quill-like structures on the head and neck of the males in the film. "We've found evidence that "Velociraptors" had feathers, or feather-like structures, and we've incorporated that into the new look of the raptor", said paleontologist Jack Horner, the film's technical adviser. Spielberg insisted that Johnston include "Pteranodons", which were removed from the previous films for budget reasons, in "Jurassic Park III". An aquatic reptile was also featured in the first draft but was removed from the final script. The creatures were