It also sends the wrong message to zoo visitors. Shouldn't the zoo teach them to respect animals?
I remember an orang utan dying after about 40 years at the same zoo: First people were invited to "come and see her a last time", attracting a huge crowd in front of her window, watching her. Afterwards her body was given away to be stuffed and exhibited.
Another example, the famous polar bear Knut, loved by many and against much protest given away to be stuffed.
Please, refrain from 'stuffing' when mentioning modern taxidermy. Knut and many other museum residents would be upset.
Preserving is always better than incinerating. Look at the stats of your zoo and check up how many animals are left for posterity to study up close & personal, and how many gone to oblivion at the rendering plant.
If one doesn't want to see a 'zoo star' in the museum, it's more wise to not visiting a museum than to protest the mounting of specimen.
Dead animals don't care what happens to their bodies at all, otherwise all the predators, scavengers, vets, hunters, taxidermists, fishermen and farmers would die instantly, having their mind tortured by ghosts
When calling the practice of selling the endangered animals to private owners inappropriate, does anyone realize that their fate & usage can be traced as well as in the case with living ones? So the parts would be used only for education & display, with no tiger skins & elephant tusks ending up on black market.
Money raised from the selling of an animal can be used for the zoo's needs, for example, exhibit renovation.
The owner should have the licence to keep such specimens in his collection, and their origin is verified by paperwork for each specimen. Individual traces are very often indicated here.
If an animal had a micro chip, it can be left in the completed mount for ID. Same with bird rings & other tags.
When the specimen goes to private collection in the same country where it lived in captivity, no CITES paperwork is needed, since no international trade happens.
In the case of international trade, it goes smoothly when done legally.
For example, I ordered & got a skull of critically endangered crocodylian species (guess which one) for only $ 90 - just because it's captive-bred and surplus.