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Banff National Park Wildlife Crossings
Grizzlies and black bears do not always choose the same way across. Parks Canada found that grizzlies tended to favor high, wide crossings, while black bears tended toward long, low underpasses. Banff makes a case for giving different species different kinds of passage.
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Christmas Island Red Crab Bridge
Watch the red crabs climb up and over the road in the Parks Australia photograph. The bridge is part of a system of tunnels, roadside barriers, and temporary road closures. It shows what happens when a familiar road gets redesigned around a migration on the scale of a crab.
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Trapper’s Point Wildlife Overpass
Groups of migrating pronghorn hesitated at the fencing when the route first changed. Wildlife Conservation Society researchers watched animals approach, turn back, and eventually cross the overpass. That makes this a useful case for watching the approaches as well as counting the animals that make it across.
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Eco-Link@BKE
Native planting gives animals something like the forest they encounter on either side of this expressway. Singapore's National Parks Board reported a Raffles' banded langur using it in October 2023. The vegetation is part of what makes the bridge worth studying.
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Snoqualmie Pass East Wildlife Crossings
The photo of a moose at the Resort Creek underpass captures only one part of the I-90 project. Washington's transportation department also documented a western toad crossing by way of the overpass with the help of a radio tracker. It is a good example of why a single kind of camera count cannot tell the whole story.
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Parleys Canyon Wildlife Overpass
This Utah bridge is unusually narrow for its length. Utah State researchers counted animals that approached or visited separately from those that made it all the way across. Mule deer were frequent visitors, giving the researchers a way to study what the narrow crossing could still do.
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Natuurbrug Zanderij Crailoo
A railway and a provincial road both cut through the landscape here. The bridge restores a route between the habitats on either side. A ranger from Goois Natuurreservaat reports finding badger, fox, and roe deer tracks, a reminder that you can learn a lot by looking down at what an animal left behind.
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Colorado State Highway 9 Wildlife Crossings
Two overpasses and five underpasses were built along this stretch of highway. The five-year evaluation reported a 92% reduction in wildlife-vehicle collisions after the full package of improvements, which also included fencing. Read the figure as a result for the whole project.
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Alligator Alley Panther Crossings
When Alligator Alley was converted to I-75, Florida installed 24 wildlife crossings and adapted 12 other bridges for panthers within the project area. The state wildlife agency reports fewer vehicle deaths for panthers where crossings and fencing are in place. For some bridges, the change was to leave a dry path along the water.
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Henry Street salamander tunnels
Spotted salamanders used to depend on volunteers to carry them across Henry Street in the spring. At the tunnels, low fences guide the animals toward the entrances. Rain helps get the salamanders moving, and the Hitchcock Center found that too much water at the entrances could keep them from getting through.
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Oracle Road Wildlife Crossings
The overpass and underpass on Oracle Road link habitat in the Santa Catalina and Tortolita mountains. Fencing helps guide animals to the openings, and the local transportation authority reported a mountain lion among the animals recorded at the crossings. The person in the underpass photo gives a sense of its size.
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Compton Road Wildlife Overpass
Studies at this Brisbane crossing documented a range of animals, including birds, reptiles, and bats. The design lesson is in the planting. When the low vegetation thinned, the crossing lost some of the cover smaller animals need, so restoring that layer mattered alongside maintaining the structure.
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Oamaru Little Blue Penguin Underpass
Oamaru's little blue penguins tend to come ashore in familiar places. The council and colony moved underground services so the tunnel could sit along the birds' usual route. The layout took its cue from where the penguins were already walking.
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