Concealment offers a large selective advantage for pocket mice that are able to successfully hide from potential predators, also known as Crypsis. Pocket mice generally show two forms of crypsis: camouflage and countershading. Camouflage is seen when an organism's coloring helps it blend into its background or environment. Evidence of camouflage is seen between different populations of pocket mice that live in two different environments. The Sinaloan pocket mouse usually has a yellow-brown coat with black hairs because they live in a sandy environment under shrubs, while the Rock pocket mouse usually has a grey or black coat color and lives among rocks. Mice who show a very different coat color than their environment are more susceptible to predation because they can be seen easier than mice that blend in with their environment. Countershading is another type of camouflage and is seen when an organism's pigmentation is darker on the upper side of the body and lighter on the underside of the body. Sinaloan pocket mice almost always have a lighter belly and sides compared to the darker color of their back. The selective advantage of this color patterning is again, concealment from predators, mostly owls in this case. Countershading helps the pocket mouse to reduce the appearance of their shadow in sunny environments. Living in the sunny desert, this color pattern has a large selective advantage. Mice whose shadows were easily seen by owls flying overhead would more likely become prey, than mice whose shadows weren't as obvious.