Check this one out!
by Hans Schekkerman
“When I found this juvenile gull standing between a ‘normal’ juvenile LBB and a Common Gull it was about half way between them in size, but structurally closer to the Common Gull! Unfortunately it didn’t wear a ring, but in my opinion everything points at Baltic Gull –it even seems to be on the ‘extreme side’ of Baltic plumage variation in several characters, e.g whiteness and lack of marking on head and underbody, and total lack of notching and barring on (particularly) greater coverts. I haven’t found a Baltic Gull photo yet with such plain greater coverts, but it seems even more unlikely that a graellsii or intermedius could show this.
Any thoughts or opinions would be appreciated,
Very conspicuous among the other gulls on the beach – including a few 100 ‘normal’ juvenile Lesser Black-backs, by small and delicate build as well as contrasting plumage. Differences with ‘ordinary’ juv LBBG:
(1) Strikingly smaller and more slender; size between LBB and Common Gull, but shape closer to Common.
(2) Very long wings creating elongated body. Primary projection 2.4 times tertial length beyond greater coverts. Depending on posture, 5 or 6 primary tips visible, with P10 3-5 mm > P9.
(3) Head smaller, more ‘friendly’ with rounded crown.
(4) Less heavy bill, rather straight with flat gonys.
(5) Shorter legs (also looking somewhat thinner), contributing to elongated impression.
(6) Head almost white with fine grey-brown streaking mostly confined to shadow patch before/below eye, crown, hindneck and rear ear coverts, and white cheeks neatly demarcated from grey-brown barring on neck sides.
(7) Underparts strikingly pale with less grey-brown patterning on white ground-colour; upper breast, belly and vent almost unpatterned white.
(8) Upperparts with almost pure white feather edges contrasting with cold grey-brown centres; no warm brown or buff hues present.
(9) Edges of wing coverts (particularly greaters) and tertials with hardly any notching, creating a completely unbarred (but rather striped) lower closed wing. (Such plain greaters must be rare even in Baltics?).
(10) Narrower black tail-band than typical contrasting with weakly patterned rest of tail, uppertail coverts and rump.
(11) Underwing basically white or very pale grey with restricted brown streaking on coverts.
(12) Hardly any pale tips visible on primaries (small pale tips in majority of LBBG).
Some aspects of the bird reminded of a young Caspian Gull but in the field this impression was counteracted by the short legs, shortish-looking neck and wrong upperwing pattern in flight.
That is no normal baby Lesser Black-backed Gull!