Pesciaiola

Identificazione

The drake smew, with its 'cracked ice' or 'panda' appearance, is unmistakable, and looks very black-and-white in flight. The females and immature males are grey birds with chestnut foreheads and crowns, and can be confused at a distance with the ruddy duck; they are often known as "redhead" smew. It has oval white wing-patches in flight. The smew's bill has a hooked tip and serrated edges, which help it catch fish when it dives for them.<p>The smew is 38–44 cm (15–17 in) long, with a wingspan of 56–69 cm, and a weight 450–650 g.

Tassonomia

Nome scientifico

Mergellus albellus

Autorità

(Linnaeus, 1758)

Ordine

Anseriformi

Famiglia

Anatidae

Genere

Mergellus

Areale e habitat

This species breeds in the northern taiga of Europe and the Palearctic. It needs trees for breeding. The smew lives on fish-rich lakes and slow rivers. As a migrant, it leaves its breeding areas and winters on sheltered coasts or inland lakes of the Baltic Sea, the Black Sea, northern Germany and the Low Countries, with a small number reaching Great Britain (for example, at Dungeness), mostly at regular sites. Vagrants have been recorded in North America. On lakes it prefers areas around the edges, often under small trees. The smew breeds in May and lays 7–11 cream-colored eggs, incubated by the female for 26–28 days. Ducklings leave the nest soon after hatching and learn to fly within about 10 weeks.<p>It nests in tree holes, such as old woodpecker nests. It is a shy bird and flushes easily when disturbed.<p>The smew is one of the species to which the Agreement on the Conservation of African-Eurasian Migratory Waterbirds (AEWA) applies. It is not considered threatened on the IUCN Red List, though its population is decreasing.

Areale riproduttivo

PAL : subarctic from n Scandinavia to Kamchatka (se Russia)

Areale non riproduttivo

to w, c, se Europe, c Asia, Japan, Korean Pen. and se China

Migrazione

Complete migrants

Conservazione

Tendenza della popolazione

declining