Maybe he should be the one hunted... (no, I am NOT serious... just angry).

The Marco Polo is an Asian species of wild sheep similar to the North American wild big horn sheep only larger.

I merely stated the fact that these are not passive stuffed animals as the previous poster suggeted. They are a wild species that is banned from import into the US presumably because there is both the risk of bringing in diseases and parasites and the risk they could crossbreed with native big horns. So what he did was illegal even before he started his cloning project. I don't hunt but I am aware that big horn sheep are hunted. The perpetrator was trying to create an oversized big horn look alike that could be shot by the idiots who get off on shooting captive animals so they could brag to their buddies that they got the biggest "big horn". Nobody does DNA tests on mounted trophies.

E

* Introduction of rabbits in Australia
* Eradication of wolves in many jurisdictions

At the least it messes with ecosystems.

It may also replace native species with hybrids and/or invasive species.

Could create reservoirs for harmful diseases that irregularly get released into wider ecosystems, like bird flu for example.

Zebra mussels, snakehead fish, Asian carp ...

Just too many examples.

It's certainly a weird and reprehensible thing to do, but it sounds like other kinds of animal husbandry and cross-breeding that's been done with domestic animals for centuries.