|Adult Caspian Gull (PADZ)|
|Primary Pattern of PADZ|
P10 overall pattern: white to black ratio, score 0, less black than white
P10: white tip, score 0, clear white
P10: tongue, score 0, whitish or pale grey tongue
P5: extent of black, score 1, black on both webs connected, forming band, black on outer web deeper than inner
P4: extent of black, score 2, no black
Iris peppering, score 1, moderately dark
Eye ring colour, score 1, not seen so scored it average
Bill shape, score 1, slim, slight gonydeal angle (within ratio 2.4-2.79)
Leg length, score 1, moderately long
This falls within the range of a pure Caspian Gull. Most of the traits shown by this individual are the most common shown by the pure Caspian Gulls sampled. The eye colour might warrant another point as it was difficult to asses, but examining the zoomed up photographs I can see the eyes are obviously darker than typical adult Herring Gulls.
Below is a copy of the sightings of PADZ so far, which was provided by the Polish Bird Ringing Centre.
|Sightings of Caspian Gull PADZ|
|Map of Sightings for PADZ|
The map clearly shows the westward movement that this gull makes during autumn and winter. It is surprising that there are no sightings from the London area - keep a look out boys.