The Link Between Daylight Saving Time and Wildlife-Vehicle Collisions

The Link Between Daylight Saving Time and Wildlife-Vehicle Collisions

By Renee Seidler

Sunday November 5th at 2 am is the end of Daylight Saving Time!

Why do we care?

The end of Daylight Saving Time, an age-old practice that is supposed to give us more waking daylight hours, is the number one worst day for wildlife-vehicle collisions in the US. That may seem odd, so let me explain. Animals (and plants!) are amazing creatures with the ability to adapt to changing environmental conditions (albeit there is almost always a time gap to achieve the greatest adjustment due to the ‘learning curve’). Animals move across the landscape to seek food and water and they move away from threats and hazards. They do this adaptively; for example, mule deer migrate in the spring following a ‘green wave’ of maturing plants as snows melt and temperatures warm, only to repeat the migration in reverse in the fall to find the most accessible winter forage such as on wind-swept or south-facing ridges.

How can you avoid getting into a collision with an animal? Knowing this information is a good start!

These animals adjust their departure time and movements each year to find the best forage. Believe it or not, these animals know our commuting hours! When we are driving through that annoying rush-hour to get home, animals avoid crossing the road as best as they can, even when the resources they need are on the other side of the road. In fact, they are so good at avoiding high density traffic that if there is no relief from high traffic levels, animals will opt to never cross the road, i.e., it becomes a barrier. So, we have conditioned animals to our predictable movement patterns to protect their own lives by crossing roads when we are less likely to be driving the road.

Then along comes Daylight Saving and we are not predictable anymore. In the fall, the end of Daylight Saving means we are suddenly driving home on weekdays one hour earlier than usual. Compound that with animals attempting to avoid hunters (which further distracts animals), seek mates during the rut/breeding season (even more distraction), migrate to more favorable climes for the winter, navigate shorter days, and you have quite a perfect storm that can spell out more animals on the road at the ‘wrong time.’ This results in more wildlife-vehicle collisions in the fall, especially starting with the end of Daylight Saving.

How can you avoid getting into a collision with an animal? Knowing this information is a good start! It is proven that being more attentive (e.g., don’t use your phone), driving the speed limit (because it makes it harder to stop before you hit the animal in the road), expecting more critters to cross the road when you see just one, knowing where animals are more likely to cross the road such as at stream crossings or migration routes (look for the road signs!), and helping warn other drivers of hazards by using your flashers when animals are in the road.

Bear Wise Jackson Hole Season in Review

Bear Wise Jackson Hole Season in Review

By Kole Stewart – Bear Wise Jackson Hole Program Manager

It’s been a busy summer for the Bear Wise Jackson Hole (BWJH) partnership.

In the last few months alone, BWJH has had the opportunity to attend over a dozen events aimed at reducing human-bear conflict in Teton County, including charging bear and bear spray deployment demonstrations and education presentations. The BWJH partnership has also played an important role in coordinating outreach efforts around the valley.

The follow are some of BWJH’s major successes this summer:

  • 520 people trained on the proper use of bear spray using the “charging bear demonstration”.
  • 13 events attended this spring/summer (e.g. Ecofair, Old Bills, HOA meetings, presentations) with approximately 4500 participants. BWJH provided education on coexisting with wild bears at these events. If you’d like to have us present at your HOA, please let us know!
  • BWJH assisted in distributing more than 120 cans of free bear spray to participants (hunters, hiking groups) at select events.
  • The partnership reached thousands of Teton County residents through bulk mailings, fliers, presentations and advertisements on local radio.

So are our efforts paying off?

While we still have a ways to go, we’re pleased to report that portions of Teton County that have been under garbage-storage regulations for more than a decade are now approximately 98% compliant, while areas new to regulations are approximately 80% compliant. We estimate areas within the newer Town of Jackson “Bear Conflict Zone” are already close to 70% compliant. 

We view these numbers as a major step in the right direction. They show substantial increases from much lower compliance rates earlier this spring. We’d like to thank our community for stepping up to reduce the potential for bear-human conflicts in the Jackson Hole area!

August Shorebird Watching in the Greater Yellowstone

August Shorebird Watching in the Greater Yellowstone

By Hilary Turner

Fall is the best time to observe shorebirds in the Greater Yellowstone Ecosystem. A few locally breeding species are present during summer, such as the ubiquitous Spotted Sandpiper, the vociferous Killdeer, and grassland obligate Long-billed Curlew; however, many members of this specialized group were in the high Arctic for the summer and are now headed south toward coastal and neotropical destinations.

American Avocets are among the most visually striking shorebirds and also the easiest to identify, even in non-breeding plumage.

Jackson Lake Dam can be a stellar place to observe shorebirds during July-October, with its sometimes-extensive mudflats. South Park WHMA can also provide good shorebird habitat, depending on water levels, and sand bars and shorelines of the Snake River can also harbor migrants during the fall.

Tringa sandpipers are among the earliest migrants we encounter in the Tetons. Whether failed breeders or northbound migrants that didn’t complete the journey, the large and stately Greater Yellowlegs can appear in the GYE as early as late June. Solitary Sandpipers and Lesser Yellowlegs are smaller members of the genus that arrive slightly later and increase in number throughout the early fall.

Greater and Lesser Yellowlegs by Dan Casey

Check for them wading along sloughs and other small, shallow bodies of water. In non-breeding plumage, the Solitary Sandpiper can look similar to the Spotted Sandpiper. To distinguish them, notice the white spots on the back and wings of the Solitary, as well as its complete white eye ring.

Calidris sandpipers are some of the smallest shorebirds that move through this area. Species like Least, Western, and Semipalmated Sandpipers move through Teton County each fall, utilizing mudflats, sand bars, and floating vegetation mats as habitat while they refuel for their long journeys. Identification is difficult, but paying attention to shape, size, leg color, and foraging strategy is often more helpful than examining plumage characteristics.

Baird’s Sandpiper. Note the golden hue and scalloped back.

The slightly larger Baird’s Sandpiper is truly impressive. Its elongated wings, specialized to take it across continents, are diagnostic in its identification, as well as its golden hue and scalloped back. Some Baird’s Sandpipers, after breeding on Alaska’s North Slope, may travel to the southern tip of South America in a little more than a month.

Dowitchers are long-billed shorebirds that travel from the high arctic to wintering grounds in the southern United States and Mexico. Long-billed Dowitchers are frequently seen during migration in the GYE, but Short-billed Dowitchers can also be detected by a skilled observer.

Juvenile birds are more easily distinguished visually by plumage characteristics than adults, but the best way to identify them is by their different flight calls. Bill length is an unreliable characteristic; while female Long-billed Dowitchers do indeed have longer bills than female Short-billed, there is plenty of overlap in male bill length.

Stilts and Avocets are tall, striking shorebirds and unlike some members of this group, easy to identify.

Black-necked Stilt

The Black-necked Stilt has the longest legs relative to its body size of any bird in Wyoming and the American Avocet has a long, strongly recurved bill that is also unique. Both also have distinct plumage patterns, although the avocet loses its cinnamon head color in the fall. Stilts and avocets are sometimes found in deeper water than other shorebirds, with avocets frequently swimming in water that is too deep for wading.

Bluebird Update 7/3/2023

Bluebird Update 7/3/2023

By Kyle and Vicki

What purpose does our nestbox trail serve?

Mountain bluebirds are a cavity nesting species which rely mainly on holes in trees, often created by woodpeckers, to raise their young. This species of bluebird is believed to be on the decline in the West due to factors such as habitat loss and competition for limited cavity nests from invasive species like house sparrows and European starlings.

A fledgling bluebird from box 44 is fed by an adult on Monday at the Fish Hatchery. Photo Vicki Morgan.

Mountain bluebirds are among the first nesting songbirds to return to the Jackson Hole area each spring. There is likely some evolutionary strategy at play here; by returning when the ground is largely still snow covered bluebirds risk exposure to lack of food and cold temperatures, but gain an advantage over rival species when it comes to snagging limited nesting sites.

Our trail of volunteer-built nestboxes on the National Elk Refuge’s western boundary not only provides bluebirds with much needed nesting locations, but allows scientists a chance to gain a more complete understanding of the overall health of this sub-population.

How are the bluebirds faring this spring?

Overall, we’re confident 2023 has been a good year for bluebirds. While we won’t have a full dataset until the end of the summer, reports from our banding team and volunteers indicate bluebirds both returned to the trail and nested in relatively high numbers this spring.

While spring conditions imperiled some nestlings early in the season, wet conditions are likely to foster increased numbers of insects later in the summer which may benefit second rounds of nests. Photo: Vicki Morgan.

At one point, 16 active nests were recorded, more than were active over the entirety of last season. According to Lead Bird Bander Vicki Morgan, who surveys boxes and organizes volunteer data weekly, there are currently two to three boxes with nestlings about to fledge, and between four and six boxes where bluebirds are on their second attempts at nest building.

Several fledglings from box 44 were even “hanging out” at the Fish Hatchery parking lot, where they were being fed by their parents as of Monday morning (don’t all go to photograph them at once!).

The success of nestboxes this year can at least partially be attributed to last year’s batch of fledglings. At least four nest boxes contain female bluebirds which were banded last year as chicks. These birds migrated away last winter and have since completed successful return journeys back to the National Elk Refuge to build their own nests, usually within hundreds of meters from where they themselves hatched. The fancy phrase for this is “site fidelity.”

What are the challenges facing this year’s nesters?

Still, bluebirds on the nest box trail have faced challenges in 2023. While nest building jumped off to a quick start, insects were slow to emerge due to late-spring weather patterns and a handful of nests failed with a lack of available food for nestlings. While nest failure is a natural and normal process, it doesn’t mean it can’t be frustrating to witness young birds not make it, especially when you’re rooting for team bluebird! Several of our boxes have also experienced predation in recent weeks. Our best guess is that weasels are the culprit – snakes can also fit through nest box holes but generally devour young birds whole. Weasels on the other hand are prone to leaving  behind “nestling bits” as evidence of their transgressions.

A 2023 fledgling with this year’s diagnostic color-band combination. Photo: Vicki Morgan

Are the nestboxes helpful for the birds?

We believe they are. Although not all nestling birds survive (you’re welcome weasels – for the buffet), the fact that many bluebirds do successfully fledge indicates the Mountain Bluebird Nestbox Project is likely having a net positive effect. Two years ago, a bird banded on our trail was recaptured and released in Texas during winter migration. And each year more and more “resights” of birds banded in previous years pour in. It’s going to take more than one productive year to help ensure the longevity of this species in our region, but that doesn’t mean we can’t get excited about this season’s results!

Stilson Lot Proposed Development

Stilson Lot Proposed Development

By Renee Seidler

At a recent County Commission meeting, Commissioners decided to hold a workshop to discuss proposals to develop the Stilson lot at the corner of WY22 and WY390.

Proposals from Teton County Parks and Recreation may include: multiple softball and soccer fields, fencing around ball fields, pickle ball courts, housing, recycling, a daycare center, a retail shop and a playground.


Wildlife Crossing Structures May Be Compromised

Teton County and WYDOT are spending a combined $7.65 million dollars to build wildlife crossing structures for the safe passage of moose, elk, deer and other species and to reduce wildlife-vehicle collisions. Two of these structures currently open into the Stilson lot area. Proposals to develop this lot could greatly compromise wildlife ability to use and move across the landscape.

Proposed development plan for Stilson lot area.

Amenities such as ball fields and retail buildings not only take up habitat that animals will no longer be able to use, but they also mean more cars and more people, equating to even greater disturbance to wildlife. Wyoming Game and Fish data show extensive seasonal and year-round use of the Stilson lot by both moose and elk. These animals use the habitat that surrounds the current parking lot for resting, foraging, and migrating.

Teton County Scenic Preserve Trust

Currently, the Stilson lot is ringed by an easement held by the county. This easement was created in 1997 and was meant to preserve Open Space for wildlife habitat, scenic resources, and/or agricultural uses. This easement was gifted to the county by the Jackson Hole Mountain Resort in trade for modified development rights north of Stilson lot, a trade meant to offset the impact of denser development in a rural residential zone. If development expands inside the Stilson easement it could severely reduce the quality of the Scenic Preserve’s Open Space and set a precedent that could challenge the protection of other land easements in our county. In this community, where we have committed to preserve and protect the area’s ecosystem to ensure a healthy environment, community and economy for current and future generations, we cannot afford to lose protected habitat.

Participate in the Process

If you would like to learn more, we encourage you to reach out to your County Commissioners. At the June 26th Board of County Commissioners Workshop, at 10:00 am, there will be an opportunity for public comment. You can also write a letter to the Commissioners and send it to You can also contact us at the Jackson Hole Wildlife Foundation office with any questions: 307-739-0968. Your voice is important in preserving our ecosystem and wildlife.

Celebrate Wildlife!

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