The European shag, or common shag (Gulosus aristotelis), is a medium-large seabird with a distinctive yellow throat-patch. During the breeding season, adults sport a small crest. This species is characterized by its metallic green-tinged sheen and a longish tail, setting it apart from its relatives with a lighter build and a more slender bill.
To identify the European shag, look for a bird measuring 68 to 78 cm in length with a wingspan of 95 to 110 cm. The adult shag has a green sheen on its feathers and a yellow patch on its throat. The bill is lighter and narrower compared to the great cormorant. Juveniles have darker underparts, and the tail consists of 12 feathers, as opposed to the great cormorant's 14.
The European shag is a coastal bird, preferring rocky shores for breeding and nesting. It is rarely found inland, as it is adapted to life at sea.
This species breeds along the rocky coasts of western and southern Europe, southwest Asia, and north Africa. It mainly winters within its breeding range, except for the northernmost populations. The largest colony is found in the Cíes Islands, Spain.
