Carnivores hunt only when hungry?

You've obviously never seen a fox in a chicken pen.
Foxes, cats, chimps (I think) all kill for fun, not just for food.
Yeah come back to me when you've seen a fox kill something five times it's size "for fun." That's what really struck me, was the fact that pack hunting large prey is a dangerous activity for the hunters, and these raptors were just slaughtering these Parasaurolophuses one after the other without eating them. Predators don't risk injury to themselves "for fun."

But I think the answer is that the raptors were bred with an aggressive gene and the hadrosaurs were in their territory. I'm betting that's the answer.
 
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