Between 10 and 12 million birds pass through the Wadden Sea annually on major migratory flyways.
Notes on verification
Confirmed by UNESCO's official listing and independently corroborated by IUCN, CMS, and the trilateral Wadden Sea World Heritage cooperation site, all citing the same figure. [tier=gold indep_score=1.0 clusters=4 claim_tier=notable | kind=empirical eligibility=high (extractor: empirical/low)]
Sources
- Global Cargo - Archaeology Magazine - May/June 2018 (seed:history_and_archaeology)
- https://whc.unesco.org/en/list/1314/ (corroboration)
- https://worldheritageoutlook.iucn.org/node/1110 (corroboration)
- https://www.cms.int/news/cooperation-between-world-heritage-benefit-migratory-birds-wadden-sea-and-banc-d%E2%80%99arguin (corroboration)
- https://www.waddensea-worldheritage.org/breeding-and-migratory-birds (corroboration)