Adult | |
![]() | white quills on outer primaries forming white panel |
![]() | narrow bill yellowish brown tip |
![]() | gray toes covered with chalky excrement |
![]() | gray skin on featherless head wrinkled neck |
Juvenile | |
![]() | black skin on head black tip on mandibles (changes to yellowish brown) |
![]() | duller black than adults |
Nestling | |
![]() | Buff colored long, thick, black beak |