Patch-nosed Snake (Salvadora hexalepis) Body length: 20 - 46" Nonvenomous. Eats eggs, lizards, small mammals, insects. Some scientists believe that the distinctive "patch nose" or enlarged nose scale, is an adaptation for excavating eggs. Patchnose snakes are day-active and are regularly seen on the inner-canyon trails of Grand Canyon National Park. Look for a fast, tan-colored snake with long stripes. When threatened, they will inflate their body and strike, as this one does at the end of the video .