In The Time of Dinosaurs

<I have to be able to see what's up ahead, up past that herd,> I said.
<I'm gonna leapfrog!>
<What?>
I didn't have time to explain. We reached the Triceratops. One huge bull swung his three-foot-long horns toward us in challenge. I sidestepped him and leaped onto the back of an equally big but less alert female.
I leaped! Soared through the air, coiled my legs, timed it just right to slam my legs down on the Triceratops's back, bounced off her, and hurtled another ten feet in the air.
From up there I could see the trap. Then I was falling.
WHUMPF!
I hit, rolled, jumped up and yelled, <You were right, it's a trap! There's a whole wall of them. A whole wall of ants! Billions! The only way out is left, but there's a sheer drop there. Can't tell how deep.>