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: Rampage Edition kill their enemies, unlike the previous game. "Rampage Edition" also features larger levels, and more weapons for Grant to use. "Jurassic Park: Rampage Edition" is a revamped version of Sega's previous "Jurassic Park" video game for the Sega Genesis, but was developed with a slightly different game engine. Sega chose to create the game after the financial success of the "Jurassic Park" film and its merchandise. A rafting level and an aviary were both based on scenes that were featured in Michael Crichton's 1990 novel "Jurassic Park", on which the film is based; neither scene was included in the film