Father and son hear unidentifiable sounds witnessed in Coconino County, Arizona

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I am actually kind of hesitant to post this report since I couldn't verify what animal was making the noise we heard. I didn't check for footprints or observe any movement on the slope that might have indicated what animal was producing the noise. We were driving back to Utah from Phoenix after attending the funeral of an old family friend. The only people in the car were my 10 year old son and I. My son has a fascination with science and more particularly earth sciences so I decided to show him the volcanic craters around Sunset Crater north of Flagstaff, Arizona and also to see the ancient ruins of Wapatki National Monument which is on the same road that breaks off of highway 89 and then rejoins it several miles north. We drove past the turnoff for the campground west of Sunset Crater and then stopped on the road that cuts into the northern slope of Sunset Crater right where a ridge of lava juts out of the ground (on the northern side of the road from the slope of the volcano) li...