The Gull-billed Tern (Gelochelidon nilotica) is a spring passage migrant, with sometimes flocks of several hundred in Hong Kong in spring.
When viewing noisy and quarrelsome flocks like this, it's easy to forget what a bold and elegant hunter of mudflat crabs it can be....
All these photos were taken in April 2017 at Mai Po Nature Reserve, Hong Kong.
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