He nodded significantly.
"We'd better get up on the slopes," he said.
They made their way around the end of the boulders, holding their guns in readiness, and headed for a small coulee that promised an easy ascent of the first slope.

At the mouth of this both paused again.

Its bottom was covered with sand, and in this sand were the tracks of another bear.

Bruce dropped on his knees.
"It's another grizzly," said Langdon.
"No, it ain't; it's a black," said Bruce.

"Jimmy, can't I ever knock into yo'r head the difference between a black an' a grizzly track?
This is the hind foot, an' the heel is round.