Zero roadkill as Amazon canopy bridges secure 15,000 crossings
Zero Roadkill: Amazon Canopy Bridges Facilitate 15,000 Wildlife Crossings
The Stark Contrast of Habitat Fragmentation
In the early morning mist of Brazil's Espírito Santo state, biologist Gabriel Falquetto often encounters the grim reality of infrastructure intersecting with nature. While traveling along the ES-164 highway toward the Kaetés Private Natural Heritage Reserve (RPPN) in the Atlantic Forest, he discovered the carcass of a buffy-headed marmoset (Callithrix flaviceps).
This particular primate is listed as critically endangered on the IUCN Red List, with a global population estimated at only individuals.
"It was extremely painful and discouraging," Falquetto shared with Mongabay. "Finding an individual in those conditions brings a feeling of sadness and helplessness... the incident reminds us of the impacts our activities have on biodiversity."
However, nearly 2,900 kilometers away near Alta Floresta in Mato Grosso, the narrative is different. Since 2024, roadkill incidents of this nature have vanished from the local roads.
The Reconecta Solution: Aerial Connectivity
To combat the "domino effect" of biodiversity loss—where highways split habitats, restricting gene flow and seed dispersal—Projeto Reconecta stepped in. Founded by biologist Fernanda Abra (a National Geographic Explorer and Whitley Award winner), the project installed eight rope bridges in Alta Floresta.
How it Works
The bridges act as artificial canopy links. To monitor success, each bridge utilizes a dual-camera system:
Camera_A: Faces the crossing to log successful passages.Camera_B: Faces the forest to see which animals approach but decline to cross.
The Result: Over a 15-month window, these bridges facilitated 15,000 safe crossings with zero no roadkill recorded.
The "Domino Effect" of Fragmentation
Wildlife Impact and Species Diversity
The bridges have become a lifeline for several primate species. The Alta Floresta titi monkey (Plecturocebus grovesi), discovered in 2019 and critically endangered, has become the face of the initiative.
| Species Common Name | Scientific Name | Conservation Status |
|---|---|---|
| Buffy-headed marmoset | Callithrix flaviceps | Critically Endangered |
| Alta Floresta titi monkey | Plecturocebus grovesi | Critically Endangered |
| Schneider's marmoset | Mico schneideri | Threatened |
| Black-faced black spider monkey | Ateles chamek | Recorded User |
| Purus red howler monkey | Alouatta puruensis | Recorded User |
| Northern night monkey | Aotus infulatus | Recorded User |
| Tufted capuchin | Sapajus apella | Recorded User |
Scaling the Success
The success in Alta Floresta is part of a larger trajectory. In 2021, Reconecta partnered with the Waimiri-Atroari Indigenous people to install 32 bridges across the BR-174 highway, spanning Amazonas and Roraima.
Future Roadmap
The project is now expanding into urban environments and international borders.
- Install 8 additional bridges in Alta Floresta's urban center.
- Coordinate with electric utilities to insulate power lines (preventing electrocution).
- Expand tools to other Brazilian biomes.
- Implement bridge systems in neighboring Suriname.
National Policy Shift
The impact of these low-cost tools has reached the highest levels of government. Brazil’s federal transport department has officially adopted the Reconecta rope bridge design as the recommended national standard for highways. This move aims to mitigate the millions of annual wildlife deaths occurring on Brazilian roads.
# Conceptual representation of bridge efficiency
def calculate_safety_rate(crossings, deaths):
if deaths == 0:
return "100% Safety Rate"
return f"Safety Rate: {(1 - deaths/crossings)*100}%"
print(calculate_safety_rate(15000, 0))
# Output: 100% Safety Rate
