"Canada built bridges for bears, and it worked better than anyone expected.
The Trans-Canada Highway cuts through Banff National Park for 82 kilometers. For decades it was a killing field. Animals on one side couldn't reach animals on the other, which fragmented populations and cut off migration routes.
Starting in 1996, Parks Canada built 44 wildlife crossing structures, along with fencing to guide animals toward them. Critics called it a waste of money. Editorials said animals would never use them. They were wrong.
Since monitoring began, animals have used the crossings more than 250,000 documented times. Wolves, grizzly bears, elk, moose, cougars, wolverines, lynx, bighorn sheep. Wildlife-vehicle collisions dropped 80% overall.
It took grizzlies about five years to trust the structures. Elk tested them while they were still under construction.
Every species had its own preference. Grizzlies and elk liked the wide open overpasses. Cougars and black bears preferred the narrow tunnels.
This is now the longest-running wildlife crossing research program in the world. Delegations have come from China, Mongolia, Costa Rica, and Argentina to copy the model."
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