I am not an absolute beginner on Delcampe, but don‘t know where to position my query! Try it here!

I have pieces of baleen from a whale (which drifted ashore, I believe, decades ago!) and I don‘t know how to categorize and subcategorize such items, should anybody be interested.

Do I simply put these under „Other collections“ – do you think? - Any brief suggestions?

I don't think you're allowed to sell them on Delcampe.

From their t&c's, section 4.1.2, forbidden items:

"Animals, human beings or any part of their body. Animal products or animal
preparations (taxidermy, butterflies, insects, ivory, tortoiseshell...), protected plants and derivative products."