TopScience.org has put together the perfect activity to show your students what camouflage as an adaptive survival strategy looks like. Even better, all you need is white paper, a pencil, a bright window to trace against, paint, crayons or colored pencils, scissors and tape. You'll also need colored toothpicks if you choose to do the extension of the activity.
To find even more free and downloadable hands-on activities with simple things to do with your students, visit www.topscience.org.