Heuglin's Gull
L.heuglini taimyrensis

Tamagawa]river@Kanagawa Kwasaki Japan
11th October 2002


 

Taimyrensis  with a Black-tailed Gull. The taimyrensis is almost summer plumage except for molting inner primaries. The mantle was darker than vegae, similar to Black-tailed Gulls. Black of the primary is more extended compared with vegae.

Taimyrensis  with a 2nd winter Slaty-backed Gull
 

Taimyrensis  with an adult summer vegae
Note the smaller size, lighter structure.


A paler individual (intergrade?) below

The mantle was similar to vegae. But the primaries show extensive black with small mirrors  like the darker individual above.


A pair from around the border of their range?
These 2 birds was making a noise throughout like a breeding pair.

One individual of the pair has pink legs and looks like Vega Gull generally, though other typical Vega Gulls tended to show more advanced primaries, streaky head and slightly paler mantle.
Another individual of the pair showed bright orange-yellow legs, but the mantle was almost same as the upper one. Sometimes such yellow-legged birds are considered as yellow-legged variants of Vega Gull. But in my experience, usually yellow-legged birds tend to show some other taimyrensis-like features in greater or less degree (molt-timing, mantle grey, size of red bill-spot, head streaking in winter or something).

Typical Vega Gulls on the same day for comparison.