Apparently, arsenic in different forms (important in terms of measuring toxicity and pathways of entry into humans) was used as late as the second half of the 20th century ("was used on birds at the Smithsonian until the early 1970s"), although the impression is that 19th and early 20th century is the more likely time ...

: the art of preparing, stuffing, and mounting the skins of animals and especially vertebrates. taxidermic. ˌtak-sə-ˈdər-mik. adjective.

Bones are often the focus of taxidermy. You can't do much with bones; they are what's left after the fur, skin, organs, and meat have been removed. However, animal bones can be used to create art or jewelry; they may also be ground up into bone meal fertilizer.

taxidermized, adj. meanings, etymology and more | Oxford English Dictionary.