A Historic Harvest With Serious Implications
When Westin Nelson of Skagway shot a mule deer in Alaska this past April, he made history — and set off a quiet alarm among the state’s wildlife veterinarians. The kill was the first recorded mule deer harvest in Alaska, and while the animal itself showed no signs of parasitic infestation, officials warn that the species’ northward expansion brings a potentially catastrophic risk to the state’s moose population.
Deer Far From Home
Mule deer are native to the Rocky Mountains and Great Plains, but their territory has been creeping northward for decades. The animals took hold in Canada’s Yukon Territory as far back as the 1980s and have been turning up in Alaska sporadically for slightly more than ten years.
The Alaska sighting record includes three animals documented near Delta Junction in 2013, one caught on camera near the Fort Knox gold mine outside Fairbanks in 2016, and a separate animal struck and killed by a vehicle in North Pole in 2017. Most confirmed sightings have been concentrated at the northern tip of Alaska’s Southeast panhandle, with a smaller number of reports from the Interior.
Size alone distinguishes these animals from Alaska’s familiar Sitka black-tailed deer, which top out between 80 and 120 pounds as adults. Mule deer routinely surpass 200 pounds at maturity — a significantly different animal in both ecological and practical terms.
Alaska classified mule deer as non-native and “deleterious” and opened them to hunting in 2019. There are no bag limits or seasonal restrictions, effectively inviting hunters to take any mule deer they encounter.
By the Numbers
- ~10+ years: Duration of occasional mule deer appearances in Alaska prior to April 2026
- ~50%: Share of mule deer examined near Whitehorse, Yukon, found carrying winter tick infestations
- 86%: Proportion of collared moose calves in Maine that died from tick-related causes in 2022
- ~50%: Estimated decline in New Hampshire’s moose population since the 1990s, attributed largely to the same parasite
- 200+ lbs: Typical adult mule deer weight, compared to 80–120 lbs for a Sitka black-tailed deer
The Parasite Waiting in the Wings
The animal Nelson harvested was clean. He submitted an extensive range of tissue samples — hide, head and neck, liver, heart, lungs, spleen, lower colon, and two lower legs with hooves — and none tested positive for winter tick, known scientifically as Dermacentor albipictus.
That result provided a measure of relief, but Alaska wildlife veterinarian Dr. Kimberlee Beckmen cautioned against reading too much into a single negative sample. “All it takes is one mule deer with one female tick on it to come into Alaska, and that would completely devastate our moose population,” she said.
The parasite has not been documented in Alaska, but its track record elsewhere is severe. Close to half of all mule deer examined in the Whitehorse region of the Yukon were found to be infested. In Maine, 86 percent of collared moose calves perished from tick-driven causes in 2022 alone. New Hampshire has watched its moose numbers fall to roughly half the levels recorded in the 1990s, with the winter tick widely identified as a primary driver of that decline.
A Broader Trend Across the North
The mule deer’s northward march fits a pattern playing out across subarctic North America, where milder winters and shifting vegetation have allowed a range of species to move into territories where they were previously absent. The consequences for established wildlife communities can take years to surface — and can be difficult to reverse once underway.
Alaska’s moose are not simply a wildlife management concern. They are central to subsistence hunting across rural communities, a significant draw for the state’s outdoor tourism economy, and a foundational element of Alaska’s ecological identity. A sustained decline on the scale seen in New England would carry consequences far beyond the biological.
The situation mirrors challenges other states and Canadian provinces have faced as species distributions shift. Coordination between Alaska and Canadian territorial authorities may eventually be necessary to track and manage mule deer movement across the border effectively.
What Comes Next
State wildlife officials plan to continue monitoring mule deer appearances throughout Alaska and have tissue-sampling protocols in place for future harvests. Nelson’s clean result is a single data point — not a clean bill of health for the species’ presence in the state.
Hunters who spot mule deer are encouraged both to report the sighting and, where possible, to harvest the animal. That dual approach — surveillance combined with active discouragement of the species’ establishment — is likely to remain Alaska’s primary tool as long as mule deer sightings remain infrequent. Whether those sightings stay infrequent is the open question wildlife managers are now watching closely.