Widespread Declines in South African Birds of Prey: 16-Year Road Surveys Sound Alarm

The Alarming Discovery from Central South Africa's Skies

South Africa's vast landscapes have long been home to majestic birds of prey, from the striking Secretarybird stalking grasslands to soaring eagles and falcons. However, a groundbreaking study has uncovered troubling news: widespread declines in these iconic raptors over the past 16 years. Researchers conducted extensive road surveys totaling nearly 400,000 kilometers between 2009 and 2025, revealing that half of the monitored species are in significant trouble.

The research, published in Biological Conservation, focused on 18 raptor species and eight other large terrestrial birds in central South Africa. Led by experts including Santiago Zuluaga from the University of Cape Town and Ronelle Visagie from the Endangered Wildlife Trust (EWT), the findings paint a picture of ecological distress. Dr. Zuluaga noted, "These results point to widespread and often severe population declines across South Africa's raptor community." This isn't just a local issue; it signals deeper environmental challenges across the region.

Species on the Brink: Who Is Most Affected?

Among the hardest hit is the Endangered Secretarybird (Sagittarius serpentarius), which saw a staggering 68% decline over the study period. Known for its long legs and snake-stomping hunting style, this bird is a grassland specialist now facing existential threats. Migratory species weren't spared either, with Lesser Kestrel, Amur Falcon, and Steppe Buzzard all showing significant drops.

Thirteen out of 26 species declined significantly, while only three increased. Spotted Eagle-Owl and Jackal Buzzard, previously considered stable, also trended downward. For context, the Secretarybird's population in South Africa has plummeted 75-80% over three decades, with fewer than 10,000 mature individuals left globally, according to BirdLife International. These losses extend beyond numbers; they disrupt food webs where raptors control pests like rodents and snakes.

Behind the Data: How Road Counts Uncovered the Truth

Road surveys provide a reliable snapshot of bird abundance because they standardize observer effort and route. The team drove 752 transects, recording sightings within 100 meters of the vehicle. This method contrasts with citizen-science atlases like the Southern African Bird Atlas Project (SABAP2), which underestimated declines—showing only 13% of species dropping while road counts flagged 50%.

Why the discrepancy? Atlas data relies on reporting rates, which can miss subtle abundance changes over large areas. Road counts offer quantitative density estimates, proving essential for wide-ranging raptors. Associate Professor Arjun Amar emphasized, "We need to combine multiple monitoring approaches for accurate population trends."

Poisoning: The Silent Killer Dominating Raptor Declines

Poisoning tops the list of threats, often from rodenticides, pesticides, and illegal baits. Vultures and eagles scavenge poisoned carcasses, leading to mass die-offs. In 2025 alone, over 200 vultures perished in two events near Kruger National Park. EWT's Vulture Safe Zones (VSZs) cover 1.8 million hectares to combat this, with over 350 landowners committed to poison-free practices.

Secondary poisoning cascades through ecosystems, affecting predators like lions. Lead ammunition exacerbates the issue, with EWT pushing for lead-free alternatives. Dr. Megan Murgatroyd warned, "Pressures across the landscape are having real and lasting impacts." Urgent bans on toxic chemicals are needed.

Infrastructure Hazards: Power Lines and Wind Farms Claim Lives

Electrocution on power lines kills hundreds annually. Between 1996-2011, 1,504 birds were reported electrocuted, mostly raptors. Cape Vultures lose 67 per year in the Eastern Cape alone (4% of local population). Collisions with wires add to the toll.

Wind farms pose growing risks as South Africa expands renewables. Jackal Buzzards account for 20% of raptor fatalities at turbines, with an average farm killing 4.6 birds yearly, 36% raptors. Black Harriers, with under 1,000 left, face extinction without mitigation like painted blades or shutdowns on migration days. EWT's GPS tracking maps high-risk zones.BirdLife South Africa's wind impact report details these dangers.

Habitat Loss and Human Expansion Fuel the Crisis

Grassland conversion to agriculture, urbanization, and bush encroachment fragments habitats. Secretarybirds need open spaces for hunting; excessive grazing and burning degrade them. Climate change and droughts compound issues, with Africa's population boom intensifying pressures.

Projections show unprotected lands suffering twice the decline rates of parks. Raptors range widely, exposing them beyond reserves. EWT's Raptor Safe Space projects secure servitudes and stewardship agreements to protect core areas.

Africa-Wide Raptor Collapse: South Africa in Context

South Africa's trends mirror continent-wide woes. A 2024 Nature Ecology & Evolution study found 88% of 42 African raptors declining over 20-40 years, 69% at extinction risk. Large species drop faster outside protected areas.The full study urges landscape-scale action.

Peregrine Fund's Darcy Ogada highlights poisoning, electrocution, and habitat loss. Southern Africa's 133 raptors include 72 declining, 33 threatened.

Ecosystem Ripples: Why Raptors Matter

As apex predators and scavengers, raptors regulate rodents (preventing plagues), snakes, and carrion (curbing disease). Their loss disrupts balance, boosting pests and disease vectors. They indicate ecosystem health; declines signal biodiversity crisis.

• Control agricultural pests naturally.
• Prevent anthrax, botulism spread via scavenging.
• Boost resilience through genetic diversity.

Champions of Conservation: EWT and Partners Step Up

The EWT's Birds of Prey Programme, since 1973, monitors and acts. VSZs ban poisons; Eye in the Sky GPS-tracks 180 vultures for poisoning alerts. Raptor Safe Spaces restore habitats for eagles, owls, harriers.Learn more about EWT efforts.

Peregrine Fund trains locals, tracks nests. BirdLife South Africa pushes policy. Successes: 200+ Cape Vultures in Karoo VSZ.

Pathways to Recovery: Proven Solutions

1. Ban carbofuran, aldicarb; promote alternatives.
2. Retrofit power lines with insulators.
3. Paint turbine blades, use AI shutdowns.
4. Protect grasslands via stewardship.
5. Enhance monitoring with road counts + atlases.

Landowner partnerships yield results; scale them up.

Photo by Weyland Swart on Unsplash

Your Role: Join the Flock for Raptor Revival

Citizen science via SABAP2 helps track trends. Support EWT, avoid poisons, report incidents. Farmers: switch to lead-free ammo. Policymakers: enforce mitigations. Together, reverse declines before iconic skies empty.