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“Muldoon worried even more about the velociraptors. They were instinctive hunters and they never passed up prey. They killed even when they weren't hungry. They killed for the pleasure of killing. They were swift; strong runners and astonishing jumpers. They had lethal claws on all four limbs; a swipe of a forearm would disembowel a man, spilling his guts out. And they had powerful tearing jaws that ripped flesh instead of biting it. They were far more intelligent than the other dinosaurs and they seemed to be natural cage-breakers.

Every zoo expert knew that certain animals were especially likely to get free of their cages. Some, like monkeys and elephants, could undo cage doors. Some, like wild pigs, were unusually intelligent and could life gate fasteners with their snouts. But who would suspect that the giant armadillo was a notorious cage-breaker? Or the moose? Yet a moose was almost as skillful with its snout as an elephant with its trunk. Moose were always getting free; they had a talent for it.

And so did velociraptors.

Raptors were at least as intelligent as chimpanzees and like chimpanzees, they had agile hands that enabled them to open doors and manipulate objects. They could escape with ease. And when, as Muldoon had feared, one of them finally escaped, it killed two construction workers and maimed a third before being recaptured.”
― Michael Crichton, Jurassic Park