Key Facts
• On July 20, at least 4 wild boars were spotted in Watarase Retention Basin.
• Watarase Retention Basin spans Tochigi, Saitama, Gunma, and Ibaraki prefectures.
• Wild boar traces were first confirmed in 2011; population exceeded 1,000 last year.
• Boar population doubled in the past three years (2022–2025).
• Residents fear for safety, especially children’s commutes to school.
• Farmers report significant crop damage, particularly to watermelons.
• Boars thrive due to favorable environment: water sources and dense vegetation.
• Hunting is restricted as the area is a wildlife protection zone.
• Boars reproduce rapidly, with 4–5 offspring per year per female.
• Experts cite difficulty in trapping boars due to their learning ability.
• Calls for urgent measures to prevent further human and agricultural harm.
Summary
The Watarase Retention Basin, Japan’s largest, is experiencing a surge in wild boar population, with sightings and damage increasing significantly since 2011. The area, spanning four prefectures, offers an ideal habitat for boars, with abundant water and vegetation. However, hunting restrictions in this wildlife protection zone and the animals’ rapid reproduction have exacerbated the issue. Residents express growing concerns over safety, particularly for children, while farmers face severe crop losses, especially to watermelons. Experts highlight the challenges of trapping boars, as they adapt quickly to avoid capture. Immediate action is needed to address the rising population and mitigate risks to both people and agriculture.
