Sources & Credits
- Participation & spending: U.S. Fish & Wildlife Service, 2022 National Survey of Fishing, Hunting, and Wildlife-Associated Recreation (birding subset).
- Participation overview: Cornell Lab of Ornithology (All About Birds) summaries on U.S. birding numbers.
- Population trends: “Decline of the North American avifauna” (Science, 2019) and State of the Birds reports.
- Images: Courtesy of project contributors. Educational, non-commercial use.
Donations ledger (updated when tips/pledges are recorded):
ledger/donations.json •
ledger/donations.csv •
Public Donations Ledger