I use this laboratory exploration to introduce the concept of comparative anatomy and how it is used to determine evolutionary relationships. Cheap chicken wings can be purchased and then boiled for the lab. I use manila file folders for them to glue the bones down on. Simple dissection tools work great for taking the bones out. I usually have my students do this exploration in partner teams. It is nice to have a skeleton for display (at least the arm). If you don't have one, then you can have a picture of the bones in the human arm available for students to look at. To make the activity more challenging, I encourage my students to try and identify the bones as well (humerus, radius, ulna, etc.).