 The following month, paleontologist Jack Horner said he would return as technical adviser for the fourth film, hinting it would feature a "Velociraptor".He was later asked about a hypothetical idea of humans evolving from dinosaurs rather than mammals; Horner responded, "Keep thinking about that, and in a couple of years go see "Jurassic Park 4"".Knightley's character was written out in late 2003.