Wildlife Corridor

Introduction

Wildlife corridors are spaces that have been left wild or rewilded to provide safe spaces for wildlife. They can consist of wide open spaces, and specialized areas built to facilitate safe crossing past dangerous roads, or rail lines.

Threats to Wildlife

Habitat fragmentation is a major threat to wildlife as it can lead to starvation, thirst, inability to find mates, or deadly consequences during seasonal migration. When animals are forced into smaller and smaller areas, their gene pools suffer, causing inbreeding, disease, and deformities. 

Effectiveness

Simple acts from humans to help reconnect spaces has proven to help wildlife flourish, as well as reduce human and animal fatalities associated with road collisions. Under and overpasses, or biopasses can reduce road fatalities by 85% to 99% in some places. Dam removals have allowed species like salmon to renew their annual breading journey where it was once impossible. Reducing boat speed and using marine spatial planning has been shown to reduce whale crash fatalities.

What to Expect on This Page

This page includes information about spaces ranging from national parks and roadway bridges or underpasses, to aquatic eco-systems. In the aquatic sections we discuss dam removal and bypass options, marine spatial planning, and more.

A Note to Planners

Many of the resources and guides listed here are for specific regions. Bare in mind that they are offered as examples of known designs suited to those regions and their specific wildlife species. You may need the advice of local conservationists, geologists, and construction specialists to determine which are most suited to your ecosystem, local laws, geology, and weather patterns before investing in new or refurbished infrastructure.

Biopasses


Canopy Crossings & Canopy Rope Bridges

These structures can help primates, sloths, and other species safely avoid human contact or deadly vehicle accidents when roadways bisect their habitats. Some tree-dwelling species such as koalas were not found to actually use the bridges, so it is important to ensure the design will be used by the target species, appealing to the target species, and if so also safe for frequent use by that species as well as others. 



Habitat Corridors

"Habitat corridors reconnect fragmented habitat. This boosts species long-term survival prospects by providing access to more resources and potential mates. Corridors are particularly important for migratory pollinators such as monarchs and hummingbirds as they require suitable habitat throughout their entire migratory range. While it is ideal for habitat corridors to be continuous (structural connectivity), patches of disconnected habitat in close proximity to one another are effective as well (functional connectivity)." - Journey North: Habitat Corridors

Dams

Dams, weirs, and other obstructions have made some migration routes totally impassable to keystone species such as salmon and eels. 

Bypass


Removal

Dams often have other negative impacts on humans, wildlife, and ecosystems, including water security issues and power shortages with the increased weather fluctuations caused by climate change. By removing man-mad obstructions, we can help repair ecosystems, and allow ancient migration patterns resume, boosting ocean life and inland ecosystems alike!

How-To Guides

Call for Broad Level Classification for Dam Removals

Hedgerows

Not only can hedgerows act as wildlife corridors, but they can also provide vital food sources, shelter from extreme weather and nesting, plus they help absorb pollutants including air, soil, and water pollution.

7:02 minute video explains how reviving our iconic hedgerows can fight climate change while combating habitat fragmentation.

Overpass

Approach Ramps

These can help small and short-legged species access ledges and stepping stone ponds.

Ledges

These can be as simple a a piece of wood board fixed to the side of a tunnel or culvert for small species to use. Generally mice, rats, snakes, and amphibians such as toads use these.

Stepping Stone Ponds

"Not likely to use structure unless located within or adjacent to their preferred habitats, in a migratory route, or during dispersal. Amphibian habitat can be created with series of ponds in a stepping-stone pattern connecting wetland habitats separated by highway Figure 42 provides an example of this pattern on a wildlife overpass."

Human Paths + Vegetation Strips

Paths for humans can also be included along side a vegetation strip for wildlife. This may make the most sense for projects within greenways, but human presence often deters species who generally avoid humans.

Vegetation

Depending on the species, vegetation can disuade some species from using a biopass, while others will not use a biopass without vegetative cover. Vegetation can offer food to hungry travelers from herbivores to pollinators.

Depending on the target species, local environment, and the stability of the overpass, plantings can include anything from native grasses and wildflowers to shrubs and trees.

Greenways & Greenbelts

Greenways are interconnected strips of vegetative spaces that wildlife and humans can use. They are generally along water ways, making use of flood-prone areas for the use of recreation or safer bike and hike areas compared to local roadways. Some communities have built their greenways via prohibitions on building in known flood areas, or specifically to prevent urban areas from expanding into farmland. 

In an attempt to build social justice, some communities have created funds to buy frequently flooded homes, so that residents facing poverty have a meaningful opportunity to buy a home in a safer location, without worrying about the new owners being stuck in a flood-prone building. Since rescuing, evacuating, and rebuilding in flood-prone areas is so costly to communities, these home-buying programs are a particularly cost effective method for keeping residents safe, and reducing climate disaster costs in the future. 

Click the Greenbelts button to learn more about different types of greenways, their benefits, and locations of existing greenways around the world.

Underpasses

Culverts

"Man-made in-stream structures (e.g., culverts, dams, levees, or tide gates) can become physical barriers that impede fish passage and reduce connectivity through habitat fragmentation. Passage may also be impeded by stream diversions, water intakes, or other structures that injure fish or cause stranding. Even un-maintained fishways can impede or prevent fish access to critical habitat. Where fish passage is obstructed longitudinally within the stream, the downstream transport of habitat elements (sediment, water, wood and other material) is often obstructed as well, along with the upstream and downstream passage of many species of amphibians, reptiles, and mammals that use stream corridors for migration and as daily movement corridors." - https://people.wou.edu/~taylors/g407/restoration/WA_Dept_Forestory_2004_Fish_Passage_Techniques.pdf 

Culverts and other biopass constructions can help fish migrate, breed, and flourish. Other species including newts, frogs, and many more can also benefit from properly built, or retrofitted culverts.



How to Make Wildlife-Friendly Culvers

Culverts on their own, poorly places, or made of inappropriate materials may prevent use by wildlife, harm, or even kill wildlife. That is why we have gathered resources focused on building appropriate designs, or retrofitting badly built culverts.

Marine Spatial Planning

Marine Spatial Planning (MSP) "is becoming a key management approach throughout the world. The process includes the mapping of how humans and wildlife use the marine environment to inform the development of management measures. An integrated multi-species approach to identifying key areas is important for MSP because it allows managers a global representation of an area, enabling them to see where management can have the most impact for biodiversity protection. However, multi-species analysis remains challenging. This paper presents a methodological framework for mapping key areas for marine megafauna (seabirds, pinnipeds, cetaceans) by incorporating different data types across multiple species. The framework includes analyses of tracking data and observation survey data, applying analytical steps according to the type of data available during each year quarter for each species. It produces core-use area layers at the species level, then combines these layers to create megafauna core-use area layers. The framework was applied in the Falkland Islands. The study gathered over 750,000 tracking and at-sea observation locations covering an equivalent of 5495 data days between 1998 and 2015 for 36 species. The framework provides a step-by-step implementation protocol, replicable across geographic scales and transferable to multiple taxa. R scripts are provided. Common repositories, such as the Birdlife International Tracking Database, are invaluable tools, providing a secure platform for storing and accessing spatial data to apply the methodological framework. This provides managers with data necessary to enhance MSP efforts and marine conservation worldwide." - https://www.sciencedirect.com/science/article/abs/pii/S0308597X17307790?via%3Dihub 

How To Improve Marine Spatial Planning

Examples

North America

Organizations

North America

Tools 

Existing Wildways

or

Wildlife Corridors

Africa

Cameroon

"The year 2022 marked a watershed for the Cameroon Wildlife Conservation Society (CWCS). As world leaders, stakeholders and activists for the protection of nature concerted and raised their voices to find sustainable solutions to climate change and a deal to reverse global biodiversity loss, CWCS made vital contributions in the crusade to keep the planet safe. Imbued with invaluable field experience, we stepped into the sea through the launch of the first Marine Protected Area (MPA) and Industrial Fishing Project in Cameroon.

This is a flagship participatory project that will support sustainable exploitation of marine coastal resources through advocacy against unsustainable industrial fishing practices and develop guidelines for management of marine section of Douala-Edéa National Park."

Kitenden Corridor

"Nestled between the foot of Mt. Kilimanjaro and Amboseli National Park lays the Kitenden Corridor. IFAW, working with the local Maasai community, secures 26,000 acres, part of which makes up the migratory route that allows wildlife to freely and safely move between Kenya and Tanzania. Daily reports provided by IFAW-funded community rangers reveal large numbers of healthy wildlife populations traversing from Tanzania to Kitenden Conservancy and the Amboseli National Park. From April and May 2021, there was an average of 5,524 wildlife sightings in the Kitenden conservancy alone.

How did the Kitenden Corridor become a safe haven for wildlife? The answer lays in the unique partnership between community rangers, IFAW, Kenya Wildlife Service (KWS), and Tanzania National Park Law enforcement officials. Working alongside the local Maasai community, we have developed a specialized system of community rangers who monitor and protect this transboundary landscape. These IFAW funded community rangers, who include IFAW’s Team Lioness, one of the first all-women ranger groups in Kenya, act as the first line of defense against poachers in Amboseli National Park. Through close relationships with the OOGR community, our officers are able to gain insider knowledge and prevent wildlife crime before it happens." - https://www.ifaw.org/news/coordinated-efforts-kenya-tanzania 

Europe

UK

North America

Western Wildway 

"In western North America, Wildlands Network envisions the world’s most extensive network of protected, connected lands: the 6,000-mile Western Wildway, also known as the Spine of the Continent. Achieving this grand vision will require coordinated conservation across international borders.

For more than 2 decades, we have been working with partner groups from the U.S., Mexico, and Canada to establish a contiguous network of private and public conservation lands along the spine of the Rocky Mountains and associated ranges, basins, plateaus, and deserts—from Mexico’s Sierra Madre Occidental to Alaska’s Brooks Range.

Protecting and connecting key core areas is crucial to rewilding the Western Wildway, where wildlife habitats have been destroyed and fragmented by centuries of human development and resource exploitation. As in the Eastern and Pacific Wildways, we’re reconnecting the Western Wildway by promoting the restoration and protection of pivotal wildlife corridors in the region.

The Western Wildway will ultimately provide wide-ranging wildlife like wolves, cougars, and other animals with room to roam, while also sustaining important ecological processes like pollination and carbon storage, and safeguarding our natural heritage for future generations.

We have worked with our partner organizations to identify the most ecologically important and vulnerable landscapes in the Western Wildway. The resulting Wildlands Network Designs (WNDs) serve as blueprints for conservation action."

"Migration is a huge feat of endurance requiring great strength and stamina. However, today birds face additional threats caused by human activity. Hungry, exhausted birds may arrive at a stopover site, only to find that it has been destroyed by farming or urbanisation. Every year, millions of birds are illegally killed by hunters, or collide with man-made structures such as powerlines. And climate change is causing habitats to shift or disappear." - https://wildlandsnetwork.org/wildways/western/ 

Oceana

Australia

Cassowary Conservation is investing in land buy backs to help create a corridor for the endangered cassowary birds

Maps

Maps are critical for this type of project. Migration maps can help conservationists work out which places need to be protected and which can be made safer during seasonal journeys. Maps that track where injuries and fatalities are most common are also of great value. Each species movements are unique, but this section is intended aid in the planning process. 

International

Aquatic Ecosystems

Oceans

Asia

Europe

Denmark

UK

North America

United States

Montana

Wyoming

Tools

Free Software for Stream Simulation

Organizations

International

Africa

Botswana

South Africa

 Europe

UK

England

North America

USA

California

Montana

Washington

Wyoming

Funding

Europe

North America

USA

Oceana

Australia

Western Australia

Further Reading