49 



KEY TO SHOREBIRDS (Cont.) 



36 Wing length 109-144 mm. 37 

 36' Wing 80-108 mm. 42 



37 Shafts of secondaries lack any brown coloration on upper surface; 

 hind toe absent; bill swollen dorsally near tip (Plate 20-3); 



breast never spotted or streaked. WILSON'S PLOVER 



37' Shafts of some secondaries have brown on upper surface, ranging 

 from entirely brown to having merely a thin, longitudinal brown 

 streak. 38 



38 One to four of the inner secondaries predominantly (90% or more) 



wh i te . 39 



38' No secondaries predominantly white. 40 



39 One to two inner secondaries predominantly white; bill black; legs 

 black. DUNLIN 



39' Three to four inner secondaries predominantly white; ridge on dorsal 

 surface of upper mandible and base of lower mandible brownish; legs 

 yellow or greenish. ROCK SANDPIPER 



40 No conspicuous white rump patch. BAIRD'S SANDPIPER 



40' Conspicuous white rump patch (white 

 brown markings) . 



41 Central tail feathers gray; bill noticeably curved downwards, >30 mm 

 long (Plate 24-8). CURLEW SANDPIPER 



41' Central tail feathers brown-black; bill straight, <30 mm long. 



WHITE-RUMPED SANDPIPER 



42 Anterior toes with no trace of webbing (as in Plate 37-3). 43 



42' Distinct partial web between outer and middle and inner and middle 



toes (somewhat like Plate 37-2). 44 



