This was an owl pellet - shards of bone, including jaw and teeth (saved), and fur. However, when I looked a bit more closely, the pellet had divided into smaller pellets, and each of these was moving. A larva was in each pellet, and as I watched, I saw larva gather more material from a nearby pellet, pulling on the fur, and fitting it into their cocoon. Weird to observe (lots of video), and I have no idea what they are. There were also many ants.
I have never heard previously of scarab larvae making fibre covered cases like Tineoidae larvae do. I thought they were C grubs with fat white bodies ?
Unfortunately, I don’t think - (or have capacity) to collect any specimens - and I was at a loss as to what they would eat, as I wasn’t sure what they were? However, I did grab some of the pellet that didn’t have larvae, as well as all the jaw bone and teeth I could find. I’m interested to know tha dung beetles deal with owl pellets as well as dung?