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
Creature suit cannot afford sophisticated 3D modeling and rendering. Films such as "Jurassic Park", which made heavy use of practical effects, including creature suits, remain well-regarded for their special effects, while CGI creatures quickly become dated as technology advances. This has led to the continued use of creature suits in modern-day films and commercials to provide additional realism, such as "Hellboy" and "". In other instances, CGI and creature suits are combined, using green parts of the suit to chroma key them and add or remove appendages in post-production. This technique was used to hide suit actors' heads in the 2005 film