Marangone dal ciuffo

Identificazione

This is a medium-large black bird, 68 to 78 cm (27 to 31 in) long and with a 95-to-110-centimetre (37 to 43 in) wingspan. It has a longish tail and a yellow throat patch. Adults have a small crest in the breeding season. It is distinguished from the great cormorant by its smaller size, lighter build, thinner bill, and, in breeding adults, by the crest and metallic green-tinged sheen on the feathers. Among those differences are that a shag is smaller and has a lighter, narrower beak, and the juvenile shag has darker underparts. The European shag's tail has 12 feathers, as do the great cormorant's 14 feathers. The green sheen on the feathers results in the alternative name green cormorant sometimes being given to the European shag.

Tassonomia

The European shag was formerly classified within the genus Phalacrocorax, but a 2014 study found it to be significantly more diverged than the clade containing Phalacrocorax and Urile, but basal to the clade containing Nannopterum and Leucocarbo, and thus classified it in its own genus, Gulosus. The IOC followed this classification in 2021. Gulosus is thought to have split from the Nannopterum-Leucocarbo clade between 9.0–11.2 million years ago.

Nome scientifico

Gulosus aristotelis

Autorità

(Linnaeus, 1761)

Ordine

Suliformi

Famiglia

Phalacrocoracidae

Genere

Gulosus

Areale e habitat

The European shag can be readily seen among the following locations during the breeding season, between late April and mid-July: Saltee Islands, Ireland; Farne Islands and Isles of Scilly, England; Isle of May, Deerness and Fowlsheugh, Scotland; Runde, Norway; Iceland; Denmark; Faroe Islands; Galicia, Northern Spain; Dalmatia and Istria, Croatia. In April 2017, eight new European shags were born in Monaco.<p>The largest colony of European shags is in the Cíes Islands, Spain, with 2,500 pairs (25% of the world's population).

Migrazione

Complete migrants

Conservazione

Tendenza della popolazione

declining