How Alberta Eradicated Rats
4 hours ago
- #Wildlife Management
- #Pest Control
- #Invasive Species
- Alberta is the largest rat-free area on Earth after Antarctica, maintaining this status for over 70 years despite sharing borders with rat-infested regions.
- Norway rats (Rattus norvegicus) invaded North America, displacing black rats, and spread westward, threatening Alberta's farms and infrastructure.
- In 1950, Alberta declared an emergency upon discovering Norway rats near its eastern border and established a Rat Control Zone to prevent establishment.
- The Rat Control Zone focused inspections on a narrow strip along the Saskatchewan border, targeting vehicles and high-risk sites like farms and grain elevators.
- Alberta implemented a 'rodent surveillance state' with public reporting systems, seasonal inspections, and Cold War-era rhetoric to foster vigilance.
- Early eradication efforts used arsenic trioxide poisoning, which caused harm to livestock and pets, but later switched to safer warfarin bait.
- Enforcement included laws requiring rat destruction, fines for non-compliance, and public cooperation, reducing sightings significantly after 1956.
- Alberta's program costs around C$500,000 annually, much less than Saskatchewan's C$1.2 million, with minimal rat damage compared to neighbors.
- Persistence is key: Alberta continues inspections, public reports, and cross-border coordination to prevent breeding populations, though rats still enter.
- Today, Alberta remains rat-free through ongoing surveillance, with few actual rats among many mistaken sightings (e.g., squirrels), and illegal pet rats are tracked and rehomed.