David Koepp spoke to University of California Television about the “rules” of filming “Jurassic Park”. Dinosaurs are never depicted as monstrous creatures, which is emphasized in the scene where Alan gently corrects Lex’s claim that they are monsters. “They’re not monsters, Lex, they’re just animals,” says Alan, reminding viewers that they are simply creatures acting on their evolutionary instincts. Koepp gave examples of scenes that corroborate this idea in the interview linked above:
“There’s a rule that no one is allowed to call them ‘monsters.’ They’re animals that do what animals do. And there’s a lot of interesting ligatures that remind us of that in that very sequence. You see the eyes of a raptor and you see a snake, a species. the reptile moves through the foreground, and then in the control room, you see Velociraptor crowing or whatever it’s doing, and its DNA code is being projected on it… There’s a lot of flourishing about the director which I think really means a lot.”
Koepp’s claim makes sense, as the first film depicts dinosaurs initially curious about their surroundings, rather than immediately hunting. When T. rex was free, its first instinct was to explore the area rather than immediately hunt down the humans lurking nearby. A similar sentiment is also reflected in the Dilophosaurus scene, in which the animal appears playful when it meets Dennis (Wayne Knight). It’s only after Dennis asks the dinosaur to take a stick like a dog that it showed an aggressive nature and attacked him when he let his guard down after falling. Dennis clearly underestimated the creature – who knew that a small, seemingly innocuous Dilophosaurus could spit venom and tear you apart?
https://www.slashfilm.com/959196/how-steven-spielberg-made-sure-jurassic-parks-dinosaurs-never-became-monsters/ How Steven Spielberg Made Jurassic Park’s Dinosaurs Never Be ‘Monsters’