Birding organisations (English language versions of non-English sites, where available, are linked in parentheses)
- The Cornell Lab of Ornithology
- Eesti Ornitoloogiaühing (Estonian Ornithological Society)
- Norsk ornitologisk forening (Norwegian Ornithological Society)
- Sociedad Española de Ornitología (Spanish Ornithological Society)
- Sovon Vogelonderzoek Nederland (Sovon Dutch Centre for Field Ornithology)
Citizen Science
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