In The Time of Dinosaurs

<You have to take it easy for a while, Rachel. You're going to end up as ->
He fell silent. He cocked his hawk's head left, then right.
"What is it?"
<I hear something. Something large.>
In addition to their amazing sense of sight, birds of prey also hear very, very well. I jumped up, grabbed him, and held him high over my head to give him the best possible view. But the truth is, I could see what there was to see well enough.
I almost dropped him.
Four... no five creatures that looked a little like rhinoceroses. Only instead of one horn, they had two hugely long horns protruding from a thick, scalloped shell around their heads.
"Even I know that dinosaur," I said. "Those are Triceratops. But they're
just plant-eaters, right? Not dangerous?"
<No, they aren't dangerous,> Tobias agreed. <But what you can't see is the pack of Deinonychus moving in to attack them. They're dangerous. But I don't think there are enough of them to go after a Triceratops. The Tri's can make a run for the river, get their backs to it, and the Deinonychus would be out of luck.>
I didn't ask how Tobias could size up the situation so well. Probably because he is a predator. Actually, two kinds of predator: hawk and human. The combination of hawk instincts and human intelligence gives him a lot of insight into the battle for survival.
<Strange. Deinonychus was supposed to have been a smart pack-hunter. But these guys have blown it. Unless . . .>
He turned his head to look behind us and let out a thought-speak moan.
<Score one for Deinonychus. We've screwed up,> he said. <They're behind us. Coming slowly this way in a pincer action to trap the Tricer-atops.>