Appearance: in summer(left) black-capped head black eyes, orange beak tipped with black, pale grey back...

Appearance: black head with white stripes on face, yellow eyes, black pointed beak, long yellow feathers...

Appearance: males and females have different coloration Males (left) are completely black except for...

Appearance: in summer (left) has black head, white body, grey wings with black tips, red feet, distinguishable...

Appearance: white head and belly, light grey back and wings,black wingtips spotted with white, yellow...

Appearance: sexual dimorphism – males are larger, look like females except during breeding season...