On The Ground With Groups Creating Wildlife Corridors
Prioritizing connections for traveling animals could slow down the extinction crisis.
We are in the midst of the earth’s sixth extinction crisis, with one in five migratory species at risk of extinction. Much of the erosion and even extinction of species is caused by shrinking ranges, habitat loss and fragmentation caused by human development, urban and suburban sprawl, and irresponsible agricultural activity.
If you live anywhere in or near suburban or urban America, chances are you have personally encountered—or at least heard about—sightings of carnivorous mammals such as coyotes and bears in your neighborhood. As we take over more of their territory, they enter ours, often looking for food.
The starkest evidence of unwanted human-wildlife interactions happens on our roadways. Every year in the US, vehicle-animal collisions result in 200 or so human fatalities, millions of animal fatalities, tens of thousands of injuries, and billions of dollars in damage to cars and other property.
That’s just the roads. There are also broader issues of connectivity. While there are large swaths of protected wildlands across the country dedicated to keeping grizzlies, wolves, pronghorn, wild cats, and other large animals safe, they are often isolated in those protective zones, unable to reach other individual animals or packs in other protected areas, leaving these groups vulnerable to inbreeding, not to mention stymieing their natural rhythms of hunting and migration.
A bipartisan infrastructure bill passed in 2021 contained $350 million for wildlife road crossings. The structures are built under or over roads, with fencing that guides animals to safety, and they are thought to reduce wildlife-car run-ins by up to 97 percent.
These crossings, constructed over or under human-made incursions in the landscape like roads, can include underpass tunnels or viaducts for mammals and amphibians of all sizes, or bridges, generally for larger mammals. These crossings provide safety and connection for animals whose habitats have been fragmented by roads and buildings. (The largest one ever made is currently being constructed in California. See its progress here).
Now, a network of activists and policy makers are working to both help heal and create links between wild areas across the US for commuting critters, and ease animals’ way under and over major roads that cut through their ranges.
Working for wolves
“We are really lucky to have a partner in North Carolina’s Department of Transportation,” says Will Harlan, southeast director and senior scientist at the Center for Biological Diversity. “The team there understands that building wildlife corridors across Highway 64 will potentially save the species, help other wild animals, and prevent human death and property loss.”
There are fewer than 25 red wolves in the wild right now, and Harlan says that five have died in the past year along that stretch of highway, which is the longest in the state, running from 604 miles from the Tennessee state line to the Outer Banks. Red wolves used to range from Texas to New York. Today, the only place red wolves still exist in the wild is in the 3,200-square-mile Abermarle Peninsula in North Carolina.
“In North Carolina, we have a super high rate of vehicle accidents, and seven percent of all road accidents are wildlife collisions,” he says.In 2010, the Department of Transportation considered widening the highway; it identified five major animal crossing areas. Harlan is currently in the midst of a major fund-raising effort to get the crossings built, with the goal of raising $2 million by August 1.
“Wolves are my personal priority, but, of cours,e I will be thrilled to see other species like [the] 700-pound black bear, rare snakes and turtles, beavers, bobcats ,and dozens of others able to safely get across the road.”
Recreating landscape links
Grizzly bears, wolverines, lynx, Mexican wolves, and bull trout are particularly vulnerable to death or extreme isolation due to the loss of natural links between landscape areas in the Northern Rockies, New Mexico and Arizona, where WildEarth Guardians focuses its efforts on restoration and safety.
“That often means protecting important areas from logging projects and pushing the agency to remove roads and motorized trails instead of building and punching in new ones.” says Adam Rissien, rewilding manager with WildEarth Guardians.
This kind of work often requires the covert monitoring of trails. Last winter, WildEarth discovered illegal activity in Northern Idaho’s Kaniksu region with the help of LightHawk, a nonprofit conservation aviation organization that sponsored a monitoring flight. Using aircraft as an asset in conservation has been on the rise, especially with volunteer-based groups such as LightHawk, which taps into its network of more than 300 pilots who donate expertise, time, aircraft, and fuel to support investigative flight campaigns with organizations like WildEarth.
Volunteers also contributed photographs documenting over-snow-vehicle tracks in essential habitat for wolverines, grizzly bears, lynx, and mountain goats. This kind of disturbance can imperil the viability of all of these species, especially as many will abandon or move dens, reducing reproductive success.
WildEarth is currently in the process of “evaluating the potential for a lawsuit to protect the habitats,” says Rissien.
The organization has also moved to challenge a Forest Service logging project outside of Yellowstone National Park on the Custer-Gallatin National Forest that it says will reduce habitat security for grizzly bears. Last year, 50 grizzly bears died within the natural park. If the project goes through, more than six square miles will be clear-cut, and another six square miles of mature forests will be logged.
“The Yellowstone grizzlies need more habitat to recover, not less,” says Rissien.
Using science to drive policy
Development isn’t the only foe of wildlife safety. Climate change, and the manner in which it is affecting where animals can and want to live, is intensifying the challenges faced by wildlife.
“Protecting and improving wildlife connectivity will help us fight against the extinction and climate crisis,” says Tiffany Yap, PhD, senior scientist at the Center for Biological Diversity’s Urban Wildlands Program. “As climate change intensifies and resources on the landscape shift, connectivity will give wildlife a chance to find the resources they need to survive and keep our ecosystems healthy.”
Enhancing connectivity across roads and through landscapes is most effectively accomplished through science-driven policy, says Yap.
In 2022, the Center co-sponsored AB 2244, the Safe Roads and Wildlife Protection Act with the Wildlands Network. California Governor Gavin Newsom signed the act into law, which received bipartisan support and requires Caltrans to identify barriers to wildlife on roads and build crossing structures when building or improving roadways.
The center also co-sponsored AB 1889, aka the Room to Roam Act with the Wildlands Network, which aims to reconnect fragmented areas for wide-ranging pumas and slow-moving newts.
“Overdevelopment and careless development along with our roads have fractured the habitat so much that animals are unable to find food, shelter, and unrelated mates,” says Yap. “This act requires local governments to consider and minimize impact to wildlife movement and habitat connectivity as part of the conservation element of their general plan.”
The legislation encourages wildlife-friendly fencing, reduced light pollution, and the planting of drought-resistant native plants that will attract native pollinators. (Wildlife-friendly fencing is highly visible to animals and birds and allows for the safe passage of animals over or under fences; typically, this means a 40-inch-tall fence with a minimum of 12 inches spacing between wires. Light pollution can be reduced by minimizing light installations, using LED lights, pointing lights downward, and using shades or covers on lights.)
“By keeping ecosystems healthy, we can better maintain the co-benefits people receive from them, like clean air and water, buffers from extreme weather, crop pollinators like bees and pest control like bats, which hunt crop-eating insects,” says Yap.
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