“That explains how you know it’s an apatosaur. What about the allosaurs?”

Leyster grinned, and enlarged the image so that a single vertebra’s imprint dominated the screen. A double-click of the trackball’s left button and—God bless Ralph!—the boneprint inverted, changing it from a negative to a positive image. He zoomed in on the caudal articular process. “If you look closely, you can actually see an allosaur tooth embedded in the bone and broken off. No signs of healing. One of those bad boys lost it, either during the attack or while gnawing on the corpse.”

Those enormous hands applauded softly, sardonically. “Astounding.” There was a kind of disconnect between what Griffin said and the way he said it. He sounded like an actor in a dying play. He held himself like a man who had heard it all before. He was, Leyster realized with a shock that was almost physical, bored. Bored! How could anyone intelligent enough to follow his explanation possibly be bored by it? Carelessly, Griffin said, “Doubtless there’s a book in it for you.”

“This is a book; it’s better than any book! There’s never been anything like it. I’ll be studying it for years.”

Leyster had already consulted with ranchers who had lost livestock to wolves and mountain lions and were only too familiar with the physical trace of predation sites. A friend at the National Museum of the American Indian had promised to get him in touch with a professional guide, a Navajo who, she claimed, could track a trout through water or a hawk through a cloud. There was no telling how much information might yet be coaxed out of this one specimen.

“Let me tell you something. When I uncovered this, when I first realized what I had, it was the single most profound moment of my life.” That was out on Burning Woman Ridge, with the mountains to one side of him and hardscrabble ranchlands to the other, and the hottest, bluest sky in all creation overhead.