The canyon tree frog (Dryophytes arenicolor) can get itself into some sticky situations, thanks to adhesive toe pads on all four feet. These tiny amphibians grow to 2.5 inches in length and range across much of Arizona at elevations up to 9,800 feet. That’s why you’ll find them in the Grand Canyon, basking on boulders near streams and stream beds. Males have a distinct call — it resembles a shrill jackhammer — and during mating season, they cast it out into the dark in the first few hours after sunset. Adults feast on small invertebrates such as ants and flies. Good grub if you can get it.