Wildlife crossings save money and lives—both animal and human
from an average of 12 a year to 2.5, reducing costs of crashes by 90 percent—over $100,000. It’s statistics like these that have led to the addition of crossings there over the last two decades.
“Grizzly bears, elk, deer, and moose prefer big structures that are open,” he says. “Cougars and black bears prefer smaller, more constricted crossings, with less light and more cover.” These inclinations are based on how each animal evolved—black bears’ and cougars’ natural home is in the forest, not a meadow, so they won’t feel comfortable on a large, open crossing structure, for example.
This informed the landscaping on the Banff crossings. “On one side we would plant trees and shrubs, and on the other side have areas that are open, planted with grass,” Clevenger says. While those animals that are already accustomed to human structures, like coyotes and deer, were using the Washington I-90 crossings almost immediately—even skirting around construction equipment—there’s a longer learning curve for other species. It might take elk, grizzly bears, and cougars a couple years to feel comfortable using the crossings, and wolverines, lynx, wolves, and, five years or more.
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