I’ve seen a couple comments in the tags suggesting zoos should trade biofacts from their deceased animals for educational purposes - it’s a good idea, but a little more complicated than that!
Most of the animals people want to touch something from (elephants, rhinos, cats) are protected under at least one and sometimes multiple federal laws. Those laws extend to cover their bodies after they pass. States may also have additional laws regarding what can be done with the remains of endangered species or marine mammals. IIRC I’ve been told by keepers that some zoos can’t even keep chunks of elephant tusks broken off of live animals (this happens, sometimes) because of ivory laws. Even if they’re just burying them on site, they have to keep detailed records to prove they’re not illegally selling the remains of protected species. So it’s a lot more complicated than just being able to keep and do whatever with the remains, even for businesses with all the right paperwork and compliance to own the live animals.
Next, you’ve got to process the remains to turn them into a biofact that can be used. I don’t know of any zoo that does this themselves. That means they’ve got to find a credible business that can clean skeletons or process pelts, make sure they can receive the remains (laws often prohibit movement of protected species across state lines, even if not alive), and then pay for the process.
Sometimes other institutions have a claim on the remains that could preclude other options, too. I know of a number of facilities with agreements with major museums or academic research groups who will take remains to study them or prepare them for display. I don’t know if the zoo can overrule them and say they’d like to keep a specific animal’s remains for other uses - probably very contract specific.
Then, right, you run into the same issues if you want to move finished biofacts between zoos. There’s a lot of laws that govern what can move where and if money can be involved, and it can require a lot of paperwork.
You also have to think about the fact that there are extreme cultural differences across the US regarding if it’s “okay” for zoos to use their animals that way. I grew up in the Pacific Northwest where the mentality is more… anti-exploitation focused? Even about good zoos. Let animals be animals, don’t commercialize them, etc. When I walked into a big Midwestern zoo a bunch of years ago and found a docent on the front plaza with an entire tiger pelt for people to pet - from a recently deceased animal that guests remembered - I was honestly kind of horrified? But after talking to a lot of people over the years I’ve really come to understand it’s a regional difference that seems to parallel how prevalent agriculture and hands-on experience with farming or game animals is culturally. There are still some things that blow my mind, though, like the time I found an elephant education cart with an entire taxidermied ear being used for outreach, or the lemur leg a docent had that was preserved bone and fur and all to show off the grooming claw.
All of the complications - logistical, legal, cultural, emotional - mean it’s much easier to get confiscated items loaned from US Fish and Wildlife to use for education. And this actually serves a second purpose! There is a massive warehouse in Colorado that holds a fraction of the illegal animal parts that USFWS has confiscated over the years. I’ve been and it’s… incredible and horrifying and really, really full. They don’t want to destroy the items if they don’t have to, but space is finite. So loaning out items as biofacts is a really good solution. It makes space and it provides a clearly legal avenue for educational facilities to access preserved pieces of protected animals. I also feel like using confiscated biofacts honors the animals, in a way, giving a second meaningful purpose to an item produced through senseless commercialized death.
We know that people appreciate and care about animals more when they can see them and have meaningful “interactions” with them - and using biofacts people can really touch and experience is a wonderful, safe way to do that. I find most docents and volunteers don’t know where the biofacts they’re using have been sources from, so it’s hard to know if a pelt is a previous collection animal or a confiscation in the moment. Regardless, it’s an incredible opportunity to understand an animal a little better (and much, much safer than doing so with a live one).