Arnold was a chain smoker in the book as well and is also killed. Didn't surprise me much. I don't think Spielberg would kill off a "popular" character. Once Malcolm was resuced by Ellie and Muldoon, he never seemed to be in any kind of critical condition. His situation was a lot more dire in the book. I guess we'd have to assume that it's based on behavior of what might be considered similar animals that exist today. But I would still maintain that Muldoon would "know" at least as much as Grant knows, and probably more since he's actually observed living Dinosaurs. Perhaps, but he does say something like "I've hunted things that can hunt you, but they way they move......" He is shown to be very aware of their intelligence and hunting behavior.