An individual ringed in switzerland. Nice escapular plane design.
30 March 2009
Species identification looks obvious, but any comment about the age will be welcomed. Patteren coverts and small white in primaries suggest to be 3rd winter. However, herring gulls moult much slower than southern taxa. It's also interesting to see worn primaries in comparison of how fresh they look in fuscus by this season with a similar timing of the moult
27 March 2009
This bird had something strange and recalled us heuglin's for primary pattern and head shape. but after consulting with some experts, primary pattern does not necessary implies a retained mould and the head shape is just strange even for heuglin's. So a nice LBB
25 March 2009
24 March 2009
Normal postjuvenile moult in YLG, some median and other inner coberts.
23 March 2009
Note that some coverts are already new.
18 March 2009
1st winter Herring gull (Larus argentatus). From 15-11-08 to 15-3-09. (picture Joan Ferrer) The first picture shows a rather fresh and typical individual, however after some weeks the birds looks much more worner.
16 March 2009
1st winter Herring gull (Larus argentatus). 17-1-09. Nice individual with some renewed lesser coverts. In spite renewing coverts it’s not typical in herring gulls, the lack of symmetry in both wings and the sequence makes more reliable a feather renewal due to an accident.
After beeing in Tarragona at least from 6-12-08 to 15-3-09 it was seen in north Catalonia in Solius by Carlos Álvaerz on 22-03-09. You have pictures from his page here:
2nd winter Herring gull (Larus argentatus). 17-1-09. This age stage can be the most difficult to separate from michahellis. Subjective features such as head, bill and body structure, primary projection and grey tone can be very useful. In this individual, the lack of black around the eye or the bicoloured bill can also help. Covert pattern is tricky to be used in this age stage.