17 



KEY A (Cont.) 



3 Belly (and remainder of plumage) black. 



MAGNIFICENT FRIGATEBIRD, adult male 



3' Belly (perhaps head and neck as well) white. 4 



4 Head and neck black. MAGNIFICENT FRIGATEBIRD, adult female 

 4' Head and neck white. MAGNIFICENT FRIGATEBIRD, immature 



5 Tarsi compressed or flattened laterally in cross section (Plate 34); 

 tail feathers very short, 16-20 in number. See LOONS (Page 24) 



5' Tarsi rounded in cross section; tail feathers long, 12 in number. 6 



6 Very large; wing >474 mm; distance from shoulder to wrist much longer 

 than from wrist to tip of primaries; foot longer than tarsus; tarsi 



>79 mm; more than 25 secondaries. See ALBATROSSES (Page 26) 



6' Wing <474 mm; distance from shoulder to wrist not decidedly longer 

 than from wrist to tip of primaries; foot about equal in length to 

 tarsus; tarsi <74 mm; 22 or fewer secondaries. See GULLS (Page 51) 



7 Primaries 10, 9, 8 and 7 decidedly cut out on outer web (check at 

 least 2/3 of the feather length), inner web tapering gradually to 

 tip; 4 long toes connected by webs; scales on fore-edge of tarsi 

 scutellate; more than 25 secondaries. 8 



7' Primaries 10, 9, 8 and sometimes 7 cut out on inner web, outer web of 

 9 and sometimes 8 cut out also; only 3 toes of foot connected by webs, 

 4th toe reduced in size; scales on legs and feet reticulate; 22 or 

 fewer secondaries. See WATERFOWL (Page 33) 



8 Wing white with dark primaries. WHITE PELICAN 

 8' Wing entirely dark. 9 



9 Belly white. BROWN PELICAN, immature 

 9' Belly dark. BROWN PELICAN, adult 



