I think that we could get an interesting night mob that would be a counterpoint to the crow. Insert an owl. Like the crow it perches at points around the yard. Unlike the crow it releases owl pellets. These are basically balls of undigested material that would be problematic to pass.  You could mine these for bone, fur, larger insect pieces, feather pieces, lizard scales and other similar material

Could be useful if anyone wants to look like a brownie from willow

I think this is great idea. The pellets sound a bit like the spider eggs so it fits in already with game. It's a logical way to get some cool resources that don't really fit in with the game yet; as you suggested fur and lizard scales.