I don't remember doing this as a kid, maybe because we did not have many Raptors in Dallas?
We played with vomit. Also, known as an owl pellet. It was fascinating. We found 2 skulls, lots of ribs, teeth, and backbones. It is amazing to see how the bones are still in tact after being captured and swallowed by an owl. This was the perfect 'boy' science experiment.