In January Henry's school held a one-day "Parent University", to show parents what they teach the kids in the classroom. Since I never went to school in the US, I figured it was a good chance to see what it's like in elementary school.
You can choose three courses, two in the morning and one after lunch. One of the courses I took was Hands-On, Minds-On Science. I happened to have a science teacher (internal) as my group partner, so she showed me how to dissect an owl pellet. The pellet is owl's spit up with all the stuffs they can't digest (feather, bones, teeth, etc.). As the teacher told me, it's pretty clean and fun, much easier than dissecting a cow's eye which the kids will do in middle school.
Take a look at this picture. Apparently this owl ate two mice in a row, there are two skulls (circled), and various bones in the pellet.