Hi Klei,
I'd like to suggest for the next QoL update that mutated monsters including hounds and pengulls have a chance to drop bone shards. I think this makes a lot of sense conceptually as those mobs are pretty much just made of bones in the first place.
A lot of uses for bone shards in the game, but they are rather difficult to farm as things exist today. This change would help solve the renewability issue of bone shards.
Thank you for your consideration!
Best,
Chaosmonkey