There is always a little wind on the mesa, a sliding current of cooler air going down the face of the mountain of its own momentum, but not to disturb the silence of great space.  Passing the wide mouths of canons, one gets the effect of whatever is doing in them, openly or behind a screen of cloud,—­thunder of falls, wind in the pine leaves, or rush and roar of rain.  The rumor of tumult grows and dies in passing, as from open doors gaping on a village street, but does not impinge on the effect of solitariness.  In quiet weather mesa days have no parallel for stillness, but the night silence breaks into certain mellow or poignant notes.  Late afternoons the burrowing owls may be seen blinking at the doors of their hummocks with perhaps four or five elfish nestlings arow, and by twilight begin a soft whoo-oo-ing, rounder, sweeter, more incessant in mating time.  It is not possible to disassociate the call of the burrowing owl from the late slant light of the mesa.  If the fine vibrations which are the golden-violet glow of spring twilights were to tremble into sound, it would be just that mellow double note breaking along the blossom-tops.  While the glow holds one sees the thistle-down flights and pouncings after prey, and on into the dark hears their soft pus-ssh! clearing out of the trail ahead.  Maybe the pin-point shriek of field mouse or kangaroo rat that pricks the wakeful pauses of the night is extorted by these mellow-voiced plunderers, though it is just as like to be the work of the red fox on his twenty-mile constitutional.

Both the red fox and the coyote are free of the night hours, and both killers for the pure love of slaughter.  The fox is no great talker, but the coyote goes garrulously through the dark in twenty keys at once, gossip, warning, and abuse.  They are light treaders, the split-feet, so that the solitary camper sees their eyes about him in the dark sometimes, and hears the soft intake of breath when no leaf has stirred and no twig snapped underfoot.  The coyote is your real lord of the mesa, and so he makes sure you are armed with no long black instrument to spit your teeth into his vitals at a thousand yards, is both bold and curious.  Not so bold, however, as the badger and not so much of a curmudgeon.  This short-legged meat-eater loves half lights and lowering days, has no friends, no enemies, and disowns his offspring.  Very likely if he knew how hawk and crow dog him for dinners, he would resent it.  But the badger is not very well contrived for looking up or far to either side.  Dull afternoons he may be met nosing a trail hot-foot to the home of ground rat or squirrel, and is with difficulty persuaded to give the right of way.  The badger is a pot-hunter and no sportsman.  Once at the hill, he dives for the central chamber, his sharp-clawed, splayey feet splashing up the sand like a bather in the surf.  He is a swift trailer, but not so swift or secretive but some small sailing hawk or lazy crow, perhaps one or two of each, has spied upon him and come drifting down the wind to the killing.