For some reason, the AP only mention this explicitly in their original article, not the linked follow-up article:
[Marco Polo argali sheep from Central Asia] are protected under international convention as a threatened species and outlawed for import into Montana to protect native sheep from disease and hybridization.
It seems to be the Lacey Act he’s charged with violating.
Seven additional months of rain have been overlooked. It just pisses it down from September to June.