Wild Peregrine Falcon Recovery from DDT

The peregrine falcon's recovery from near-extinction after DDT banning is one of conservation's greatest success stories.

Key Facts

Peregrine populations crashed 80-90% in North America due to DDT causing eggshell thinning
DDT was banned in the US in 1972 following Rachel Carson's Silent Spring publication in 1962
Captive breeding and reintroduction programs at Cornell University and elsewhere helped recovery
Peregrines now nest in cities where skyscrapers replicate cliff habitat and pigeons provide abundant prey
They are the fastest animal on Earth reaching over 320 km/h in a stoop
Peregrines were removed from the US Endangered Species List in 1999
The recovery validated the direct link between pesticide use and wildlife decline

Welfare Considerations

DDT poisoning caused reproductive failure and progressive population collapse over decades. Birds exposed to sublethal DDT experienced hormonal disruption affecting breeding behavior and eggshell formation. The welfare harm was invisible until populations were already critically depleted. Recovery demonstrates that addressing root causes - removing the toxic agent - allows natural welfare restoration. City-nesting peregrines face traffic collision and rodenticide secondary poisoning as ongoing urban welfare concerns.

What You Can Do

Support raptor conservation and monitoring programs tracking peregrine population health
Avoid second-generation anticoagulant rodenticides that accumulate in raptors feeding on poisoned prey
Advocate for restrictions on persistent organic pollutants that bioaccumulate in raptor food chains
Participate in citizen science programs monitoring peregrine nest sites in your region
Support urban peregrine nest box programs that help city-nesting pairs raise chicks successfully
Learn about the peregrine recovery story to inspire advocacy for other pesticide-affected species