After years of dwindling, the last remaining herd of caribou known to roam between Canada and the U.S. Pacific Northwest was down to just one known member this winter.
For the foreseeable future, the capture put an end to the Selkirk herd in the wild, which was already what biologists consider “functionally extirpated.” The herd was one of 15 isolated subpopulations of a broader group known as southern mountain caribou, which, as their name indicates, live in different landscape from the robust northern tundra herds. All 15 are shrinking, mostly because of human development that fatally altered their habitat.
“They don’t call them the gray ghost for nothing,” Entz said, using a nickname for the animals, which have always been elusive. The forest has been fragmented over decades by logging, roads, power lines and, in Canada, oil exploration and mining. Smaller foliage that grew back in its place attracted moose, deer and elk, and they, in turn, drew predators. The predators make their living off the plentiful newcomers, DeGroot said, but the caribou became “bycatch.” Wolf culls in Canada did not help the Selkirk caribou.
The pens are typically used as temporary caribou obstetrics wards and nurseries. Because newborns are particularly vulnerable to predators, managers move pregnant females to the enclosures, where they are fed until the calves are more than a month old.
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