ML41667671
Iceland Gull (Thayer's x Iceland) Larus glaucoides thayeri x glaucoides/kumlieni
Contributeur
Peder Svingen Fichiers multimédias de ce contributeur Profil
Date
Site d'observation
Duluth--Canal Park
St. Louis, Minnesota, United States
Fichiers multimédias de cet endroit Liste illustrée- Âge
- Non précisé
- Sexe
- Non précisé
Commentaires
Thayer's–Iceland intergrade (lower left) shown here in comparison to two adult American Herring Gulls.
Détails de l'observation
Adult Thayer’s Gull X Kumlien’s [Iceland] Gull at Canal Park, Duluth, Minnesota, 24 Nov 2016. At first glance, the reduced amount of pigment in the wingtip (tiny mark on outer web of p6 and no markings on p5) and less-than-true-black markings on p7-10, suggest Kumlien’s Gull. However, the white mirror on p10 is not terminal, and the white tongue-mirror on p9 does not extend completely across p9 to join the p10 mirror. Up to 20% of the Kumlien’s-type gulls of all ages that we image in the Duluth-Superior area prove to be intergrades.
Informations techniques
- Modèle
- Canon EOS 7D
- Lentille
- EF500mm f/4L IS USM
- ISO
- 800
- Longueur focale
- 500 mm
- Flash
- Flash did not fire, auto
- f-stop
- f/5.0
- Vitesse d'obturation
- 1/400 sec
- Dimensions
- 3405 pixels x 2432 pixels
- Taille originale du fichier
- 6.3 MB