In 1994/95,the Canadian MacKenzie Valley Gray Wolf (the largest and most aggressive subspecies of the Grey Wolf) was brought in and released in Yellowstone and Idaho. What was left of the indigenous and truly endangered Canis lupus irremotus has most likely been replaced by the transplanted Canis lupus occidentallis.
This larger, more aggressive, subspecies has multiplied exponentially under protection of the ESA and is currently decimating ungulate populations as well as domestic livestock herds in the Northwest.
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