32 



KEY TO BOOBIES (Cont.) 



8 Belly mottled dark and white; dark breast clearly defined in con- 

 trast to mottled belly - demarcation line straight. 



BROWN BOOBY, immature 



8' Belly all one color or dark with light feather tips giving delicate 



scaled effect. 9 



9 Dark belly feathers with fine, light edgings; feet green to yellow; 



bill length 90-101 mm; tarsus 41-51 mm. BROWN BOOBY, immature 



9' Feathers without light edges; feet reddish; bill 77-90 mm; tarsus 



34-43 mm. RED-FOOTED BOOBY 



KEY TO CORMORANTS 



1 General body coloration very dark with green or purple iridescence. 



1' Body all brown or mostly brown (except sometimes belly like 1 

 above); brown of belly and neck may be a very light sandy color 

 or almost white. 



2 Lower mandible yellow, culmen black. 3 

 2' Bill dark brown all over. 4 



3 Bill short and deep (length only 2.7 - 3.4 times greater than depth 

 at base) with very prominent and sharp hook, curving far below tip 

 of lower mandible (Plate 9-1); throat skin yellow or orange; back 

 feathers bronze with black edges giving a scaly appearance; long 

 white or black plumes may or may not extend up and back from above 



each eye. DOUBLE-CRESTED CORMORANT, adult 



3' Bill thinner (length 3.7 - 4.1 times greater than depth at base), 



hook barely reaching below lower mandible (Plate 9-4); face and throat 

 skin red; back feathers dark iridescent green, not scaly; flank 

 feathers may or may not be white; two crests on head, one extending 

 back from forehead and the other projecting from back of head. 



RED- FACED CORMORANT, adult 



