Brown Skua vs Chilean Skua

Brown Skua

Stercorarius antarcticus

Large1.7 kgMarine

This is the heaviest species of skua and rivals the largest gulls, the great black-backed gull and glaucous gull, as the heaviest species in the shorebird order although not as large in length or wingspan. It is 52–64 cm (20–25 in) in length, 126–160 cm (50–63 in) in wingspan and has a body mass of 1.2–2.18 kg (2.6–4.8 lb). S. a. hamiltoni measured on Gough Island, weighed an average of 1.43 kg (3.2 lb) in 9 males and 1.65 kg (3.6 lb) in 9 females. S. a. lonnbergi measured in the Chatham Islands weighed an average of 1.73 kg (3.8 lb) in 30 males and an average of 1.93 kg (4.

ID text from Wikipedia, CC BY-SA 4.0

Photo: River Ahlquist · CC BY 4.0

Chilean Skua

Stercorarius chilensis

1.4 kgMarine

Chilean skuas tend to be dark on their back, flanks, and cheeks, and uniformly light underneath. The dark colour usually extends from their back across the upper chest to form a pectoral collar. The underside of their wings is characteristically cinnamon-coloured, but this colour can be rather dull in some individuals. All adults have a distinctive dark cap and prominent pale gold streaking on the face and neck. They have black legs, brown irises, and a small, bluish bill with a dark tip. Their wingspan is 130 to 138 cm. Voice: Very little information is available on the vocalizations of the Chilean skua. At the breeding colony, it performs a long-call which consists of ten to twelve short nasal barks. This call is seemingly unrelated to chick-rearing and has been described as almost goose-like due to its distinctly deep and hoarse nature. Other calls may include short guttural grunts.

ID text from Wikipedia, CC BY-SA 4.0

Photo: Arthur Chapman · CC BY 2.0

Photos and recordings are credited to their authors under the licence shown. Full profiles: Brown Skua and Chilean Skua.