Numenius phaeopus
Notably smaller than Curlew. Bill is shorter and curves more closer to the tip. Markings on head much more prominent than in Curlew, with double dark lateral crown-stripes (light stripe on top of crown) and dark eye-stripe. Note that young Curlews have noticeably shorter bill than adults! Gives an overall darker impression than Curlew, especially underwing and flanks.
Song starts similar to Curlew with long wailing notes "kluuueee", which then accelerates to a continuous, vibrating single note. Lacks the cyclic phrase ending of Curlew.
Wikipedia: map (se also Xeno-canto below)
Birdlife ecology