The term for animals that blend into their environments is "cryptic coloration" or "camouflage." This adaptive strategy enables animals to avoid detection by predators or to become more effective hunters themselves. Many species exhibit this behavior through their skin patterns, colors, or shapes, which mimic elements of their surroundings, such as foliage, rocks, or sand. Examples include chameleons, which can change color, and stick insects that resemble twigs. Camouflage is a vital evolutionary trait that enhances survival, demonstrating the intricate relationship between organisms and their habitats in the context of natural selection.