Corridors and Crossings Archives - Center for Large Landscape Conservation

A brown-howler monkey (Alouatta guariba) crosses a horizontal ladder canopy bridge over a road in southern Brazil. Credit: Precisa

Canopy Bridges: Reconnecting Forest Canopies for Wildlife

Busy roads can be both a barrier to movement and a major source of mortality for arboreal animals that live in the surrounding trees. One example is a section of Route 1 between Barranca and Limonal, Costa Rica, where 10 howler monkeys were struck by vehicles in 2022. Many roads in the country cut through dense forest, fragmenting the landscape and requiring arboreal species to drop to ground level to access habitat on the other side. But—thanks to a temporary canopy bridge that was installed while the road is being upgraded—the monkeys can safely shimmy across cables high above the road and its traffic.

The Appalachian Mountains: A Biodiversity Superhighway

When people think about the Appalachians, they picture mountains. I think about a rich landscape of mountains and valleys woven together by rivers so old that the mountains rose up around them. It’s this mix that creates the sweeping views we love, from the Blue Ridge Parkway to the hills just beyond our back yards. But the Appalachians are so much more than breathtaking scenery. They form the backbone of a region that’s essential for the well-being of people and wildlife alike.

Wildlife warning sign, Brazil 262. CLLC photo

Report from the Field: A Road Trip of Wonder and Horror Along a Brazilian Highway

Known worldwide as an ecotourism destination for its rich biodiversity, the Pantanal biome is home to many of Brazil’s quirky and elegant, iconic species such as the feathery tailed, gentle-looking giant anteater, the stub-nosed, water-loving capybara (the world’s largest rodent!), and the tapir—a three toed ungulate with an elongated snout that is most closely related to the rhinoceros. But wildlife habitat in and around this vast, tropical landscape is gradually shrinking as land is cleared for production of some of the country’s biggest exports such as beef and soybeans. And wildlife movement is increasingly hampered by highways.

Within the biosphere reserve and adjacent to Montecristo National Park in El Salvador, many producers grow coffee under the shade of banana trees and other tall trees, resulting in more flavorful coffee beans. Credit: CLLC/Gabriel Oppler

Connecting Across Borders in Central America

The Trifinio-Fraternidad Transboundary Biosphere Reserve (TFTBR) is a land of steep mountains covered by dense tropical forest, home to iconic species such as quetzal and puma, small cities and rural villages, and a thriving coffee-growing economy. Spanning parts of Guatemala, Honduras, and El Salvador, the TFTBR is a model in transboundary environmental governance, established primarily to safeguard vital water sources that originate in the mountains and flow to major population centers in all three countries. The Center for Large Landscape Conservation worked with UNESCO and partners in the TFTBR on the project “Scaling up Connectivity in the Trifinio-Fraternidad Biosphere Reserve” to strengthen habitat connectivity and landscape resilience in this richly biodiverse region.

Wild Dogs In The Road - Credit: Zambian Carnivore Programme

From Yellowstone to Zambia: Protecting Safe Passage for Wildlife

Yellowstone National Park in the western United States is a crucial landscape populated by iconic species like bison, wolves, grizzly bears, elk and pronghorn that are part of the largest concentration of wildlife in the lower 48 states. Kafue National Park in Zambia is, similarly, a stronghold of biodiversity and hosts elephants, lions, cheetahs, wild dogs, and antelope, which all roam the vast landscape. Despite being thousands of miles apart, Kafue and Yellowstone share similar challenges: major roadways cut through critical habitat and impact wildlife movement.

Connecting Communities and Wildlife: A Local Planning Guide

Wildlife don’t stop at city limits, county lines, or property boundaries—and neither should local government planning. The decisions communities make today about how and where to build will shape whether future generations inherit thriving landscapes that sustain people and wildlife alike. That’s why CLLC created a new report on wildlife habitat connectivity and local government: to bring together the policy tools and practical strategies that every community and every community member—whether you’re a resident, planner, biologist, developer, or legislator—can consider using to help keep landscapes connected.

Snow leopard - © Muhammad Osama / WWF-Pakistan

Designing Infrastructure With Snow Leopards in Mind

With complex, sprawling ranges across the high mountains of South and Central Asia and low population densities, snow leopards are an elusive species. Over the last decade, however, urban centers and communities surrounding their habitats have become increasingly connected, with many more investments in infrastructure on the horizon. How can new linear infrastructure—including roads, railways, and power lines—meet human needs while protecting snow leopards, their prey, and the fragile ecosystems they depend on to survive?

US-93 Overpass, Montana - CLLC/Gabe Oppler

Montana Governor Signs Bill Approving State License Plate to Fund Wildlife Crossings

On May 8, Montana Governor Greg Gianforte signed a bill into law that will help keep drivers and wildlife safe on the state’s roadways. House Bill 855 creates a dedicated fund and authorizes a new state specialty license plate expected to generate up to $160,000 per year. Revenues from sales of the plate will help contribute to the planning, design, and construction of wildlife crossing structures, which have been proven to reduce wildlife-vehicle collisions. The Center for Large Landscape Conservation (CLLC) supported the bill as part of its work to advance solutions that reconnect fragmented wildlife habitat in Montana and globally.

Collaborative Planning for Ecological Connectivity in Québec

Across deciduous and evergreen forests, lakes, streams and wetlands, working farms and timber lands, Québec, Canada is enormously rich in ecological diversity. However, pressures from people—residential and commercial development, climate change, and pollution—increasingly threaten the biodiversity that depends on intact habitats. Black bears and eastern wolves need wide swaths of land in their home ranges to find food and mates, wood turtles rely on unfragmented corridors to safely reach water sources, and migratory birds need stepping stones of habitat for their seasonal movements.

Orcas At The Kenai Fjords National Park In Alaska. Credit Nps Jim Pfeiffenberger

Blue Corridors: Habitat Connectivity for Marine Species

Oceans cover roughly 71% of Earth’s surface, yet much still remains to be discovered about their vast depths. As scientists learn more about the ocean’s diverse and complex ecosystems, they are shattering preconceived notions and showcasing the interconnectedness of land and sea. Terrestrial wildlife needs habitat connectivity for survival, often relying on ecological corridors between parks and other protected areas. Thanks to research in recent years, it is becoming increasingly clear that habitat connectivity is just as important in the marine environment.

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