Secret Lives

Secret Lives

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Researchers with the Voyageurs Wolf Project , a collaboration between the park and the University of Minnesota, have for the first time documented wolves hunting freshwater fish as a seasonal food source — and they have video to prove it.

Earlier studies on wolves in the park have shown that they eat a large number of beaver — and even blueberries — to supplement their diet, which still relies heavily on deer. These new discoveries, which were recently published in the journal Mammalian Biology, were possible thanks to new technology. Since , researchers have been placing GPS collars on wolves from seven different packs in and around the park. They collect location data from the animals every 20 minutes, which allows them to zoom in on the animals' predation habits at a finer scale than earlier versions of the collars had permitted: When wolves spend more than 20 minutes at any one site, they know they're probably eating something.

Wolves lead researchers to record pine at Voyageurs.

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That's how they first suspected members of the Bowman Bay pack were eating fish. In April , University of Minnesota researcher Tom Gable hiked to a creek where one of the collared wolves had spent a lot of time. He was searching for evidence of a kill. I was hiding in the shrubs on the edge of this creek.

For the next 15 minutes or so, Gable watched the wolf meander back and forth around the creek. Periodically it would run into the creek and splash around. Then it stopped, and looked like it was eating something, before returning to the creek. Eventually the wolf left, and Gable came out of hiding to explore the area.

He realized right away the wolf was hunting fish — spawning suckers — in the creek. Gable and his colleagues quickly learned that little scene he witnessed wasn't just a one-time meal. In the month after his hike to the creek, researchers found the two GPS-collared wolves in the Bowman Bay pack spent about half their time hunting fish there.

About a year later, Gable and his colleagues noticed the pack visiting the creek again, so they set up trail cameras, and caught footage of the wolves fishing at night. The video also captured wolves catching fish and not eating them right away. Instead, they stored them on the bank of the creek, and fished some more.

The secret lives of wolves in Voyageurs National Park: They fish and eat berries | MPR News

That behavior provides a glimpse into a wolf's mental processing, Gable said. Scientists have known for a long time that wolves in coastal habitats in British Columbia and Alaska eat spawning salmon. But this is the first time similar behavior with hunting freshwater fish has been detailed. But wolves are elusive, he said: Those collars have helped shed new light into wolves' secretive lives in the dense boreal forest of northern Minnesota.

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Researchers mapped 68, GPS locations the packs visited just this past summer. They eat a lot of blueberries in July and August. By the time the fruit ripens in northern Minnesota, deer fawns — wolves' primary prey in June — are old enough to escape them. Five former classmates agree to split the cost of a rental house in Santa Barbara.

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