Search found 226 matches

by adriaens
Sun Oct 19, 2014 7:55 pm
Forum: Caspian Gull
Topic: 4 birds: pure Caspians or...?!
Replies: 30
Views: 10127

Re: 4 birds: pure Caspians or...?!

Still... Kozielno is in the very south of Poland, close to the Czech border. If you check the breeding distribution of large gulls in Poland (see http://www.academia.edu/1056046/Neubauer_G._Zagalska-Neubauer_M._Gwiazda_R._Faber_M._Bukacinski_D._Betleja_J._Chylarecki_P._2006._Breeding_large_gulls_in_...
by adriaens
Sat Oct 18, 2014 6:16 pm
Forum: Caspian Gull
Topic: 4 birds: pure Caspians or...?!
Replies: 30
Views: 10127

Re: 4 birds: pure Caspians or...?!

Perhaps we will learn more from the ringing data, but in any case such a tail pattern is well within the variation of Caspian Gull. So is the bill shape (which can be a lot stubbier, by the way). I have attached 4 different 1w Caspian Gulls from Georgia (January 2014), showing tail pattern. Note als...
by adriaens
Fri Oct 17, 2014 8:48 pm
Forum: Caspian Gull
Topic: 4 birds: pure Caspians or...?!
Replies: 30
Views: 10127

Re: 4 birds: pure Caspians or...?!

The 4th set of photos are way too poor, but the other three birds look like normal Caspian Gulls to me. As a remarkable coincidence, I came across PNKA myself today! It was in the harbour of Oostende, Belgium: http://waarnemingen.be/waarneming/view/89245952 The flight shots reveal a normal pattern f...
by adriaens
Sat Aug 23, 2014 3:38 pm
Forum: Other taxa & hybrids
Topic: 3cy med gull x BHG?
Replies: 2
Views: 2677

Re: 3cy med gull x BHG?

I believe this bird is still within the variation seen in Med Gull, Lou. I have attached 5 different examples here, photographed in Boulogne (France) and in Belgium. The few hybrids that I have seen, have always shown the white leading edge to the outer wing of Black-headed Gull. MedGull_2s_Zandvlie...
by adriaens
Wed Jun 25, 2014 1:00 pm
Forum: Belarus
Topic: Questions of identification
Replies: 5
Views: 4810

Re: Questions of identification

For iris colour, see Gibbins et al (2010). An excerpt: " Eye colour varies enormously in cachinnans: Jonsson (1998) suggested that c. 75% of adult cachinnans appear 'medium- to dark-eyed' in the field, whereas Liebers& Dierschke (1997) found that 48% of birds in one Ukrainian colony and 62% in anoth...
by adriaens
Tue Jun 24, 2014 10:24 am
Forum: Belarus
Topic: Questions of identification
Replies: 5
Views: 4810

Re: Questions of identification

Hi,
the second bird looks normal for (pure) cachinnans to me.
by adriaens
Sat Apr 19, 2014 8:09 pm
Forum: Identification
Topic: Sp, Gull seen on 15.4.14 - WHAT IS THAT ?
Replies: 5
Views: 2448

Re: Sp, Gull seen on 15.4.14 - WHAT IS THAT ?

Hi,
to me, this looks like one of those "not really barabensis" types that seem to be present in the Middle East in small but significant numbers.
It is probably best to leave such birds unidentified.
Sorry to not be able to say more...
by adriaens
Wed Apr 09, 2014 6:39 pm
Forum: Identification
Topic: Caspian or Yellow-legged.
Replies: 2
Views: 1640

Re: Caspian or Yellow-legged.

Actually, this looks like a Herring Gull to me...
by adriaens
Mon Mar 31, 2014 7:37 pm
Forum: location Bucharest
Topic: Ringed Caspian Gull - February 10th 2014
Replies: 13
Views: 6613

Re: Ringed Caspian Gull - February 10th 2014

I don't think that canus is involved here.
Probably a small michahellis, would be my guess also.
by adriaens
Sun Mar 30, 2014 7:44 pm
Forum: Identification
Topic: herring?
Replies: 2
Views: 1395

Re: herring?

Probably an odd Great Black-backed Gull, would be my guess - though I cannot rule out a big michahellis.