This was on Montana FWP's region 7 Facebook page.
"Wildlife doing best they can to survive winter conditions
With southeastern Montana settling into harsh winter conditions, it’s only natural for people to wonder how the wildlife are faring. There is no simple answer, other than the animals are doing the best they can. Some winter mortality is inevitable even in mild years, and only time will tell how much of a toll this winter will take.
As of last week, FWP Region 7 biologists and wardens reported observing no major impacts yet, but they were seeing signs of stress on wildlife. And that was before it snowed up to nine inches in parts of the region over the weekend.
According to biologists, deer were already struggling to adapt to drought conditions before winter set in, moving over to winter browse as early as September. And the continuing snowfall and cold temperatures will further tax them.
“This year’s drought has left many deer in poorer-than-average condition,” said Wildlife Biologist Melissa Foster. “Fawns are noticeably smaller than normal. For deer, every winter is a test of endurance. They rely on stored fat reserves to make up the difference between their daily energy expenditures and what few calories they can consume. Even slight deficits in stored fat reserves can have big impacts. Deep snows or bitterly cold temperatures cause deer to use up precious energy at a faster rate.”
“Even in the absence of hunting, normal overwinter mortality is around 25 percent for deer, and we expect that figure may be higher this year,” Foster said.
The drought impacted vegetation, which is important for both nutrition and for cover. In addition, there was emergency haying and grazing of CRP, further reducing vegetation and cover.
“Overall, I’m not seeing any mass die-offs,” Warden Sergeant Todd Anderson said last week, “but I am seeing some fawns that appear to be in very poor condition.”
Heavy snow is forcing animals to shift their feeding patterns.
“In the last week, I’ve been at two calls of mule deer that have been caught in fences attempting to get into haystacks,” Anderson said.
“What I am seeing is not necessarily animals dying of starvation, but with the snow depth, deer cannot judge the height of fences,” he explained. “Snow physically stops them from getting a good jump.”
On February 13, Warden Captain Jack Austin necropsied a mule deer doe that had been caught in a fence.
“She had a fawn that was also dead, probably frozen while waiting for the mother stuck in the fence,” Austin said.
The doe’s body condition and bone marrow still looked healthy, according to Austin. If the bone marrow had appeared reddish and jellied, it would be an indication of malnourishment.
Anderson and Austin also dealt with a subadult mountain lion in extremely poor condition that was seen trying to catch turkeys, but it failed and, exhausted, eventually crawled under someone’s porch in Colstrip.
“Likely, it was a young lion that moved off from its mother and was not a successful hunter, and with the snow it just starved to death,” Anderson said.
It’s not just the inability to get to food and water that impacts animals, it’s also the energy expended in the pursuit of it.
“It’s the physical, draining part of getting around that affects the wildlife, more than the food,” Anderson explained. “There are still some areas of sagebrush and other food items they are able to get to, but the amount of snow is a physical barrier to where it takes so much energy to move in it, that when they get to it, it’s got to be very good habitat.”
When animals do find a food source, they are camping on it until it is depleted, he said.
Region 7 Wildlife Biologist Steve Atwood echoed that.
“It’s evident in the north how critical habitat has shrunk for sagebrush-dependent animals, and they are keying in on those remaining areas,” Atwood said.
While conducting annual aerial elk surveys, he has observed heavy trails between accessible sagebrush areas.
In the south, elk and mule deer are congregating on south- and west-facing slopes where they can warm up faster and avoid the wind. Antelope are falling into big wintering herds, and Atwood said the deep snow is disrupting their movements.
“I’ve seen spots where antelope are trapped,” he said. “They try to go under the fences, but there’s too much snow.”
Atwood urged landowners in areas without cattle to keep some gates open so antelope are able to cross to food sources. Last week he did observe one antelope caught in a fence.
As far as what the public can do for wildlife, he said, “Just give them some space, and know that they are stressed.”
Dr. Jennifer Ramsey, wildlife veterinarian for Montana Fish, Wildlife & Parks, explained how tough winters impact wildlife populations.
“We see an increase in mortality of the young and the old animals, especially when we have deep or crusted snow and subzero temperatures,” Dr. Ramsey said. “The carcasses of these animals are generally in poor body condition, as the animal wasn’t able to keep up with the nutritional and energy demands to survive.”
“In addition to winter kill, we see an increase in animals using unnatural food sources like haystacks, grain feeders, etc.,” she said. “In some cases, overconsumption of such rich feed causes fatal problems like rumen acidosis/grain overload, which can cause rapid death in healthy-looking animals. Also, attraction to these sorts of feed sources tends to cause congregation of animals, and the closer proximity to one another, and droppings, etc., increases the risk of transmission of any infectious disease that might be present in an animal.”
For these reasons, Montana Fish, Wildlife & Parks does not do supplemental feeding of wildlife, as it can do more harm than good.
“The tendency is to feel sorry for animals and want to feed them,” Anderson said, “but that is not the answer, because artificial feeding to animals in poor condition can cause them to die faster, and cause intestinal problems that are fatal.”
“The strong survive, and the weak die; it’s an unfortunate truth,” Anderson said.
But wildlife populations have the ability to recover quickly. That’s what happened after back-to-back harsh winters in 2010-11. By 2017, mule deer populations had rebounded to 47 percent above the long-term average. Region 7 adopted the maximum quota of 11,000 antlerless “B” licenses to try to balance the number of mouths on the landscape with available resources.
“It’s somewhat counterintuitive, but by harvesting heavier in the fall, you can actually end up with more deer on the landscape the following year,” Foster explained. “You split those critical and limited winter resources between fewer deer. The result is higher overwinter survival."
After a mule deer doe was caught in a fence trying to access a haystack, FWP necropsied the doe. The solid appearance of the bone marrow in her foreleg indicates that she was still relatively healthy and did not die of malnutrition.
By contrast, a mule deer buck fawn necropsied in late December shows reddish, jellied-looking bone marrow, which is an indication of malnutrition. The snow and cold temperatures were just setting in for the season, so the drought was probably the biggest contributor to this young deer’s poor condition."