Jurassic Park (1993) I'm wondering how much they've thought this through. Ironically enough, Jack Horner -- the paleontologist upon whom Michael Crichton based the character Alan Grant (Sam Neill) -- is the scientist making this big announcement: While Dr. Jack Horner, who has consulted on all four Jurassic films, initially believed the key to recreating the prehistoric creatures lied in working with ancient DNA strands, further study about DNA degradation over time has since ruled out that possibility. Instead, a group of scientists at Harvard and Yale have turned their eye to -- wait for it -- the modern-day chicken.