There are two coyote packs in the area. I surmise this because I've heard them both yipping at the same time–one at the lower end of the canyon, the other at the upper end. I rarely see any of them, but they are always around leaving sign. Big tracks, little tracks and little piles.
It's reassuring to hear them yipping and yapping away. It tells me they are still at their vital business keeping rodent populations in check. A business I fully approve of and support.