Calidris tenuirostris breeds in north-east Siberia, Russia, wintering throughout the coastline of South-East Asia, and also on the coasts of Australia, India, Bangladesh, Pakistan, and the eastern coast of the Arabian Peninsula¹. The global population has been estimated at 380,000 individuals, of which 176,000 were thought to pass through South Korea¹⁰. Since then the reclamation and development of wetlands in South Korea has led to a decline in the observed counts of non-breeding populations, mostly notably including dramatic declines at the Saemangeum wetland which previously held c.20-30% of the global population on migration^13,14. Despite there being no observed declines within the Chinese portion of the Yellow Sea, further declines at smaller staging grounds in Japan and at major wintering grounds in Australia make it clear that the population is declining overall^11,12,16.