Sirens sound in the far distance. This coyote hurries to the edge of a cliff and looks ready to howl, but for some reason never gets going with it. He throws his head back several times and engages in small nodding, but all we get out of it is one very short bark in the middle of the video.
There is another coyote nearby involved in hunting, within view of this one — possibly that one is hot on the trail of some prey which it doesn’t want to lose, and therefore doesn’t want to be interrupted? Might this coyote have been waiting for a go-ahead cue from the other, the alpha — a cue which was not forthcoming?