31 



KEY TO BOOBIES 



1 Belly entirely white or very light gray (almost white). 2 

 1' Belly not white but rather mottled or dark. 8 



2 Breast very dark brown; demarcation between breast and belly straight 

 and abrupt. 3 



2' Breast white or light brown; if brown, coloration grading gradually 



into belly or boundary not straight. 4 



3 Forehead white or lighter than crown; feet green. 



BROWN BOOBY, adult male 



3' Forehead and crown same dark color; feet more yellow. 



BROWN BOOBY, adult female 



4 Throat entirely white. 5 

 4' Throat with some brown. 6 



5 Tarsus 34-43 mm; bill length 77-90 mm; bill depth 28-34 mm; feet and 

 legs red. RED-FOOTED BOOBY 



5' Tarsus 53-62 mm; bill 98-106 mm; bill depth 35-38 mm; feet and legs 



blue-gray. BLUE-FACED BOOBY, adult 



6 Feathers on head and neck light centrally with outer parts dark 

 giving these areas a streaked appearance; feet light blue. 



BLUE-FOOTED BOOBY 



6' Head and neck not streaked. 7 



7 Head and neck dark brown, sometimes speckled; measurements as in 

 5'; feet light blue, occasionally tending toward pinkish. 



BLUE-FACED BOOBY, immature 



7' Non-white color of neck, head or shoulders very light; measurements 



and foot color as in 5. RED-FOOTED BOOBY 



