Over the past two years the National Park Service brought 19 wolves captured from a variety of places to Isle Royale National Park to restore the predators on an island overrun with moose.
Nearly half the wolves died shortly after being released. Some died of unknown causes, one died of pneumonia, but most were killed by other wolves in territory battles.
https://www.startribune.com/as-smaller-wolves-die-huge-wolves-from-ontario-establish-packs-on-isle-royale-national-park/573439051/
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