- Over hunting
- Habitat loss
The Slender-Billed Curlew, like other curlews, has a long down-curved bill and distinct mottled brown plumage that has camouflaging functions in its natural environment. This wader shorebird species is similar in size with the Whimbrel, another curlew from the Scolopacidae family.
Between the late 19th century and the early 20th century, the Slender-Billed Curlew is relentlessly targeted by hunters across its wintering grounds. Degradation and destruction of forest bogs, shallow freshwater areas, and coastal wetlands where it feeds and breeds also contributed to the fast declining number of this migratory bird species.