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Isle Royale wolves dwindling; moose holding on

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Wolves on Isle Royale declined 21 percent over the past year due in part to "toxic" inbreeding and battles between packs, while moose on the island continue to feel the effects of a warming climate.

That's according to a report released Wednesday from the 52nd annual study of the predator-prey relationship between wolves and moose on the big Lake Superior island.

Wolves dropped from 24 in 2009 to 19 this year, and two of the island's four wolf packs have disappeared.

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