Wolves, as it turns out, might not be the bloodthirsty, moose-slaughtering, northwoods-roaming carnivores you always thought they were.
New research on wolf packs at Voyageurs National Park in northern Minnesota is challenging the conventional wisdom on wolves: Their diets are a lot more varied than scientists previously thought.
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.
A diet of meat and berries
Wolves still rely heavily on deer, but earlier studies on wolves in the park have shown that they also eat a large number of beaver — and even blueberries — to supplement their diet.
These new discoveries, which were recently published in the journal Mammalian Biology, were possible thanks to new technology.
Since 2015, 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.
That's how they first suspected members of the Bowman Bay pack were eating fish. In April 2017, 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.
He looked up, and saw a collared wolf about 50 feet away. But the wolf didn't see him.
"It was really crazy," he said. "He came within about 8 to 10 meters of me and he had no idea I was there. 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.
"And then as I explored the area even more, I found wolf tracks all over the mud on the creek, and I found fish scales and blood and guts all over the edges of the creek, and you could just see that wolves had been spending a lot of time there," he said. "And there were wolf scats as well that were full of fish scales and fish remains."
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.
"You can see the wolves abruptly head to the water several times after hearing a splash," Gable said. "They learned what a fish splashing in the creek sounds like and they know that it means food."
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.
That behavior provides a glimpse into a wolf's mental processing, Gable said. "It somehow knew that there were going to be more, so, it might as well go get fish while the fishing was good, and then come back later to the fish after he had gotten what he could."
A first for freshwater fishing
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.
"Given the impressive adaptability of wolves to find food, it is not entirely surprising," said project adviser Joseph Bump.
But wolves are elusive, he said: "Especially in the densely forested areas of northern Minnesota, you have to either be in the right spot at the right time or have access to GPS-collar data."
Those collars have helped shed new light into wolves' secretive lives in the dense boreal forest of northern Minnesota. Researchers mapped 68,000 GPS locations the packs visited just this past summer.
Among their major findings, so far:
- Wolves are omnivores. 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.
- Wolves eat beavers -- a lot of them. Beaver can constitute up to 42 percent of a pack's diet from April until October, researchers have found. Preliminary data show that, on average, one wolf in Voyageurs kills about six to eight beavers per year. But that varies. Individual wolves might not eat any beavers at all. But they found one wolf that had eaten 28 beavers in one year.
- Wolves hunt beaver differently than they do other prey. Instead of chasing them, they lie in ambush, and strike when the beaver venture onto land.
- Wolves are good swimmers. One collared wolf swam 12 times across sections of Rainy Lake over a two-day period, covering 2.6 miles.
All these findings help confirm what scientists have understood for a long time: Wolves are highly adaptable creatures, which is why they've been able to thrive in so many different habitats, from North America to Europe to Asia.
"Wolves are opportunistic. They can adapt pretty readily to new food sources," explained Steve Windels, a wildlife biologist at Voyageurs National Park.
Still, he admitted it's exciting to confirm behaviors scientists have suspected, especially in wolves in Minnesota that haven't been studied as intensively as their counterparts in Yellowstone National Park and elsewhere.
One of the remaining details Windels hopes to tease out is the complex relationship between wolves' predation on beavers, deer and moose and the impact it has on their populations.
Voyageurs is unique in that it has one of the densest populations of beaver in the region. It also is one of the only places in Minnesota where the moose population is holding steady. In other parts of northeastern Minnesota, moose have declined sharply in the past decade for a host of reasons, including disease and other health-related causes, but in part because of wolf predation.
It's still too early to make a direct tie between Voyageurs' steady moose population and its abundance of beavers for wolves to feed on, Windels said. But "this is a great opportunity for us to really get at that question just because of the of the density of beavers that we have here that creates a unique laboratory where we can actually start to see how that dynamic plays out."
In the meantime, the wolf research at Voyageurs has been getting a lot of attention. A recent Facebook post mapping the different wolf pack territories in the park has drawn over 500,000 views, Gable said.
"That's really a satisfying part about doing all this is to share what we're actually finding with people, and to see how excited people are about the work that we're doing."
ARI SHAPIRO, HOST:
New research out of Voyageurs National Park in far northern Minnesota challenges what many of us thought we knew about wolves. It turns out wolves don't just hunt deer and moose. Some of them also eat a lot of blueberries, and they even fish. Dan Kraker of Minnesota Public Radio has more.
DAN KRAKER, BYLINE: In spring of 2017, University of Minnesota graduate researcher Tom Gable tramped for about an hour through thick, swampy woods to a site where a wolf he was tracking had been hanging out. And as he approached, he spotted it splashing in a creek. So he quickly hid behind some shrubs.
TOM GABLE: Luckily, the wind direction was just perfect that day. And the wolf had no idea I was there. And so it actually walked down the creek bank almost directly towards me and would stop every 10 meters or so and crunch on something and then just keep walking.
KRAKER: This was incredibly rare. Gable and his colleagues had been using GPS collars to track wolves in Voyageurs National Park since 2015. But he never got this close before, so he pulled out his iPhone and started filming.
(SOUNDBITE OF ARCHIVED RECORDING)
GABLE: (Whispering) Coming towards me right now, has no idea I'm here.
KRAKER: The wolf walks just 20 feet from Gable and still doesn't see him.
(SOUNDBITE OF ARCHIVED RECORDING)
GABLE: (Whispering) Now it's feeding on a fish carcass.
KRAKER: Eventually, the wind shifts. The wolf sniffs the air and bolts into the trees. And Gable starts collecting evidence.
GABLE: And in the creek bed, I could see wolf tracks just everywhere. And then I found fish scales scattered across the creek bank as well. And I started finding bits of like the suckers and northern pike that were there.
KRAKER: Scientists have long known that wolves on the Pacific coast hunt spawning salmon, but this was the first time researchers documented wolves eating freshwater fish to supplement their diet. Then this spring, they noticed wolves were back in the same spot. So they set up video cameras capturing footage of a wolf snatching a big fish out of the creek at night. But it doesn't just wolf it down. Instead, it carries the fish onshore and drops it, kind of like an angler putting a fish on a stringer. And then it returns to kill another one while the fishing is good.
GABLE: And I'm guessing it learned, probably through trial and error, that it was a much more efficient strategy to kill the fish sort of in one bout and then spend your time eating them later.
KRAKER: Gable and his colleagues have made some other surprising discoveries. Wolves in Voyageurs National Park feast on a lot of blueberries in the summertime. They also eat a lot of beaver, but instead of chasing them, they lie in wait sometimes for hours to ambush them. Steve Windels, wildlife biologist at Voyageurs National Park, says the research confirms just how adaptable and opportunistic wolves are.
STEVE WINDELS: Wolves can be quite successful in pretty much any environment in North America.
KRAKER: A big remaining question is just how significant these food sources are. John Erb studies wolf behavior with the Minnesota DNR. Which is not affiliated with this research.
JOHN ERB: It's just a question of, was it a nice extra meal or does it have actual numeric influence on the wolf population or the pack?
KRAKER: Researchers plan to pursue some of those larger questions by placing GPS collars on more wolves next spring. For NPR News, I'm Dan Kraker in Duluth, Minn. Transcript provided by NPR, Copyright NPR.