Appearance:

Very large tern, with deep, dagger-like, blood-red bill with dark tip. Large, black cap reaching well below the eyes. Grey upperparts and white underparts. Rather short tail. Outer primaries distinctly darker than the rest of upperwing, and outer underwing almost black. Unmistakable from the size alone, and leaves a gull-like impression, lacking the elegance of smaller terns. Immatures with paler bill and white forehead (as in adult winter), and markedly speckled back. Hovers and dives. Often rests on the surface, feeding like a gull.

Sound:

Easily recognized by its very harsh calls. Sometimes likened to the sound of a plate of steel being dragged across a concrete floor. Similar in harshness to Grey Heron, but more drawn, with an accented middle; "Kraaeeet", or with a double syllable start "ka-ha-kraaaeet". Immature birds begs with a penetrating, sharp whistle.

Contact call:

Distribution:

Wikipedia: map (se also Xeno-canto below)

Ecology:

Birdlife ecology

Links:

Observation.org Latest observations

Video IBC

Image search Flickr NB! May give other species

Sound search at Xeno-canto

CC

CC-photo:lgooch, Licence,Link.

CC-photo:Muchaxo, Licence,Link.

CC-photo:ajmatthehiddenhouse, Licence,Link.

Appearance:

In all plumages recognized by its long tail, call, and choice of habitat (reeds). Male unmistakable, with bluish grey head, yellow bill and black drooping moustache. Females and juveniles mostly plain, yellow-brown with whitish underparts and no moustache. Young females with dark bill, young males with yellow bill and black lore. Juveniles with black patch on back and black outer tail feathers. Flight whirring and undulated. Sometimes fans tail in flight with twisting motions.

Sound:

More often heard than seen. Usually identified by contact call; a ringing, explosive "tschin" with a characteristic "dirty" timbre. Also a hard and very short "pit", often mixed with the previous. Song a primitive, 3-syllable phrase, consisting of contact call-like sounds.

Contact call:

Distribution:

Xeno-canto: map

Ecology:

Birdlife ecology

Links:

Observation.org Latest observations

Video IBC

Image search Flickr NB! May give other species

Sound search at Xeno-canto

Featherbase

CC

CC-photo:sussexbirder, Licence,Link.