In this case, the canyon was still in shade, so it was dark enough to get a slow shutter speed with a small aperture and low ISO. That is how I do most of them. Sometimes add a polarizing filter in bright light, which darkens the lens even more. My camera will go as low as ISO 50, which helps (some only go down to either 100 or 200). When I was in Miami last summer I bought a neutral density filter, which darkens the lens even more, but I have only used it on a few scenic shots (water motion) and not really for animals. However I could if I needed to.
