4cy Caspian type
Posted: Mon Oct 14, 2013 6:53 pm
Hi all,
I would like your thoughts on this 4th-calendar type bird, seen last week at the waste dump of Barneveld, The Netherlands.
It is showing a mix of Caspian and Herring/Yellow-legged features:
- Broad bill with well-marked gonydeal angle (Herring/Yellow-legged)
- Dark iris
- Head pattern reminiscent of Yellow-legged
- Gray tone as Caspian (too dark for Herring, too light for Yellow-legged/argentatus?)
- P10 with white type and small dark spots on both webs and P9 with small mirrors on inner web should rule out Yellow-legged
- P10 tongue invisible unfortunately
- P5 with black on both webs forming band, on outer web deeper than on inner
- No black on P4
- All white tail
I would like your thoughts on this 4th-calendar type bird, seen last week at the waste dump of Barneveld, The Netherlands.
It is showing a mix of Caspian and Herring/Yellow-legged features:
- Broad bill with well-marked gonydeal angle (Herring/Yellow-legged)
- Dark iris
- Head pattern reminiscent of Yellow-legged
- Gray tone as Caspian (too dark for Herring, too light for Yellow-legged/argentatus?)
- P10 with white type and small dark spots on both webs and P9 with small mirrors on inner web should rule out Yellow-legged
- P10 tongue invisible unfortunately
- P5 with black on both webs forming band, on outer web deeper than on inner
- No black on P4
- All white tail