On 06 Jan 2013 - most of these flocks comprise of about 80% Brown-headed Gulls, 10% Slender-billed Gulls, 5% Black-headed Gulls, 5% - other "big" gulls and terns - usually Caspian, Common, and Gull-billed; since other tern species make their own massive flocks.
Here, inset shows 4 small crops of the 4 species that are part of this section of the flock.
- Ramit
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