Jurassic Park Fans! Can you answer this question?

All right, so in the first Jurassic Park book, Dr. Grant discovers that the dinosaur vision is based on movement, so basically if you stay still, then

All right, so in the first Jurassic Park book, Dr. Grant discovers that the dinosaur vision is based on movement, so basically if you stay still, then it can't see you. He proved his thought with a maiasaur when he and the kids are stuck in the park. However, in the second book (The Lost World), when Dr. Malcolm, Dr. Levine, Dr. Harding, and others are on the Isla Sorna trying to discover the source behind extinction, they watch through video surveillance as the Biosyn people (including Dodgson) attempt to steal eggs from a tyrannosaur nest. When the Biosyn people freeze so that the returning tyrannosaurs will lose them, Malcolm says they were "badly misinformed" while Levine insists that the theory of movement-based vision is idiotic. The theory fails when the tyrannosaurs can see the Biosyn people and one dies. So...what happened? Why are dinosaurs' visual abilities different on Isla Sorna than on Isla Nublar? Any thoughts?

or:All right, so in the first Jurassic Park book, Dr. Grant discovers that the dinosaur vision is based on movement, so basically if you stay still, then it can't see you. He proved his thought with a maiasaur when he and the kids are stuck in the park. However, in the second book (The Lost World), when Dr. Malcolm, Dr. Levine, Dr. Harding, and others are on the Isla Sorna trying to discover the source behind extinction, they watch through video surveillance as the Biosyn people (including Dodgson) attempt to steal eggs from a tyrannosaur nest. When the Biosyn people freeze so that the returning tyrannosaurs will lose them, Malcolm says they were \"badly misinformed\" while Levine insists that the theory of movement-based vision is idiotic. The theory fails when the tyrannosaurs can see the Biosyn people and one dies. So...what happened? Why are dinosaurs' visual abilities different on Isla Sorna than on Isla Nublar? Any thoughts?

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