Gadwall (Mareca strepera)
Great Black-backed Gull (Larus marinus)
Medium sized dabbling duck. Male with grey plumage, mottled breast, black rump and vent lacking white framing. Female brown and easily overlooked and confused with female Mallards. Bill with dark center and evenly broad orange sides. Plumage more greyish than female mallard, with a more slender body and steeper forehead. Diagnostic white wingbars and contrasting white belly in all plumages.
Sound:Males display-call a short dry rattling or croaking sound and some high whistling notes. Female quacking similar to Mallard, but drier and shriller.
Display-call:
Distribution:
Wikipedia: map (se also Xeno-canto below)
Ecology:Birdlife ecology
Links:
Observation.org Latest observations
Image search Flickr NB! May give other species
CCCC-photo:Smudge 9000, Licence,Link.
Adults: Black back and pinkish legs. Large white windows at tips of primaries, and broad white trailing edge of wing. A very heavy gull with a heavy bill and broad wings. Juveniles with pale head, boldly spotted back and heavier bill than Lesser Black-backed and Herring Gull.
Sound:Can be identified from the low pitch alone. Clearly deeper than Lesser Black-backed and Herring Gull.
Call:
Distribution:
Xeno-canto: map
Ecology:Birdlife ecology
Links:
Observation.org Latest observations
Image search Flickr NB! May give other species
CC