The eskimo Curlew is probably although not confirmed to be extinct. According to Thomas et al, "Can intrinsic factors explain population declines in North American breeding shorebirds? A comparative analysis," in Animal Conservation Volume 9 Issue 3, Pages 252 - 258, its decline is probably due to large-scale habitat change. The conversion of upland areas (along with suppression of fire) into agriculture is one of the main reasons for the extinction of the Eskimo curlew Numenius borealis, a continental migrant whose numbers plummeted during the late 1800s and early 1900s. The authors cite Gill, R.E. Jr., Canevari, P. & Iverson, E.H. (1998). Eskimo curlew (Numenius borealis): number 347. In The birds of North America: 1-28. Poole, A. & Gill, F. (Eds). Philadelphia: The Birds of North America, Inc.