James Cameron attempted to buy the rights to the novel "Jurassic Park", but Spielberg beat him by a few hours.
He described his version as "'Aliens' with dinosaurs."
https://m.huffingtonpost.co.uk/2012/09/07/titanic-director-james-cameron-jurassic-park-steven-spielberg_n_1864996.html
Cameron on his approach to Jurassic Park: “But when I saw the film, I realized that I was not the right person to make the film, he was. Because he made a dinosaur movie for kids, and mine would have been aliens with dinosaurs, and that wouldn't have been fair." Dinosaurs are for 8-year-olds. We can all enjoy it, too, but kids get dinosaurs and they should not have been excluded for that. His sensibility was right for that film, I'd have gone further, nastier, much nastier."share