1) The document discusses different animals that use camouflage including owls, moths, katydids, chameleons, cheetahs, octopuses, anemones, glass catfish, lemmings, ptarmigans, sloths, and leaf-tailed geckos. 2) It provides details on how chameleons can change their skin color and texture for camouflage. Some octopuses can also change their texture. 3) Arctic animals like ptarmigans, lemmings, and Arctic hares grow new summer coats gradually instead of instantly changing color because they do not have cells in their fur that allow for rapid color change