The California Channel Island fox population increased from about 1,500 individuals to about 5,500 after the National Park Service removed golden eagles, bred and reintroduced foxes, and inoculated them against disease.
Notes on verification
Numbers closely corroborated by IUCN Red List assessment (Coonan et al. 2013) and independently reported by Mongabay; intervention methods confirmed by NPS official sources. Minor discrepancy between total population (~5,500) vs. mature individuals (~4,000) subsets, but overall trajectory and methods are well-supported by multiple independent sources. [tier=gold indep_score=0.867 clusters=3 claim_tier=notable]
Sources
- 5 Winners and Losers on New “Red List” of World's Rarest ... (seed:environment_and_wildlife)
- https://www.canids.org/species/view/PREKJY135341 (corroboration)
- https://news.mongabay.com/2016/02/recovery-of-island-foxes-a-historic-success-officials-recommend-removing-them-from-endangered-species-list/ (corroboration)
- https://www.nps.gov/chis/learn/news/pr052116.htm (corroboration)