The film portrays Grant differently than the novel, giving him an introverted personality and a dislike of children. However, over the course of the first film, he warms to Hammond's grandchildren. This was because Spielberg wanted to "provide a source of dramatic tension that did not exist in the novel". In the film, Grant specializes in "Velociraptors" ("raptors"), and believes that birds are closely related to dinosaurs. By the end of the film, his experience on the island changes his view of children (and dinosaurs) and he decides not to endorse Jurassic Park.