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ZEISS DTI thermal imaging cameras. For more discoveries at night, and during the day.

Larus sp. (1 Viewer)

I don't know Caspian in this plumage (they arrive in Belgium with 1st winter plumage). I wonder why the tertials are so dark, also how could we eliminate Heuglin's (much rarer, however).
 
Hi osprey.

Where and when is your gull taken?
It is a juvenile/1st winter gull which have some Caspian Gull features such as the head and bill shape. Regarding the plumage, greater covert + scapular pattern (tertials are not seen well) it could well be matched by a Caspian Gull as well. However could a Yellow-legged be excluded?

JanJ
 
juvenile caspian gull. tertial crescents are just hidden or not so well visible in this crop. it has a pretty strong greater coverts pattern for cachinnans, yet that extremely pointed long bill and small head to me excludes a yellow-legged gull.
 
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