Skulls and Bones is for global skeletal remains, and I believe at least New Zealand and South Africa have region specific projects for skeletal remains.
Bird Tracks and Signs is a global tracking project dedicated to evidence of birds, including pellets, eggs, nests, tracks, signs of feeding, bird calls and more. Feathers and bones are welcomed here, but I’d recommend adding them not only to that project but feathers to Found Feathers and skeletal remains to Skulls and Bones as well.