Can you help us?

My 5 year old found it on a hike. It was in a rocky area on the edge of a forest. We first thought it was a big wing but was told that would only have 5 “levels” of bones. The bones look fragile but are hard when I press on them with my nail. Adult female hand for scale.

My 5 year old found it on a hike. It was in a rocky area on the edge of a forest. We first thought it was a big wing but was told that would only have 5 “levels” of bones. The bones look fragile but are hard when I press on them with my nail. Adult female hand for scale.