Bugs
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As someone who has skeletonized many animals for museums insects are your best bet. We use [dermestid beetles][1], they are kinda finicky critters.  Other insects like ants and maggots work just as well for your purposes. 

Bug boxes which prevent larger scavengers are often used outside letting the local scavenger insects do the work. Ours are plastic but you can make something out of wicker, ceramic, or wood just as easily. What you are making is a container that lets insects in but keeps out larger scavengers like rodents which will gnaw bones. 

[![enter image description here][2]][2]

Sometimes we will boil a carcass first to take must of the soft tissue off, but if you are not doing it as an industrial process, just letting ants eat it all is fine. You do have to watch out for termites which will burrow through the bone. Cutting off most of the soft tissue first speeds up the process, but again it is not vital.

[Here][3] is a great dirty jobs video of the process. 

degreasing the bones for storage is a good idea (soak in soap or low concentration peroxide) but not vital, time will do nearly as good a job as long as you clean them once and a while to prevent mold. 


  [1]: https://www.semanticscholar.org/paper/The-cleaning-of-Skeletons-by-means-of-larvae-of-Meeuse/b7f1c7ce5c07e14dc7bbd4366ade27c874092586
  [2]: https://i.sstatic.net/BIXhO.png
  [3]: https://www.youtube.com/watch?v=7r6LNiqGFuM