The answer is in the spotted pattern of the fawn. As sunlight falls between the leaves and branches of the plants in the forest, a dappled pattern of light and dark spots are spread across the ground. The outline of the baby deer could be seen among the vegetation, except that the spotted fawn itself looks like its surroundings. It also is important to know that mammals, with the exception of primates (including humans), do not see color. Light receptors in the back of the eye called cones allow an animal to see color. Most mammals lack the cones, so other receptors called rods allow excellent distinction of shades of gray. Thus, the brown coat will not stand out against green grass or leaves in the eyes of the mammalian predator. Notice that it is more difficult to see the fawn in the black and white photograph as compared to the color image. Birds, lizards, and other vertebrates can see the color of the deer, but they are of no importance as predators, so their ability to see the color of the fawn is irrelevant. Those large mammalian predators that are a threat to the young deer have difficulty seeing the broken pattern, which has saved many fawns from the jaws of an enemy. As the young deer gets older, it becomes larger and stronger and relies on speed for escape. When molting replaces its hair, it no longer will be spotted.