Teens experience natural selection firsthand (or first beak) in an activity that has them act as finches foraging for food. Using different household items  to act as different beak styles, your little finches will collect as much food as they can from the sources available. After a storm limits the food supply and isolates the finches on different islands, they will have to see if their adaptations prove to be an asset or a death sentence. Throughout the activity, the finches will double as field biologists, recording data and reporting it out to the class.