The other animals never tried to do this.

The mule was evidently better versed in the art of getting a living than the horses.
Above the rough bed of the canon the bottom was gravelly and narrow, and the walls on each side nearly perpendicular.

Our horses now poked slowly along and as we passed the steep wall of the canon the white animal left the trail and walked with full force, head first, against the solid rock.

She seemed to be blind, and though we went quickly to her and took off the load she carried, she had stopped breathing by the time we had it done.

Not knowing how far it was to water, nor how soon some of our other horses might fall, we did not tarry, but pushed on as well as we could, finding no water.