Caspian Tern - This is the worlds largest of the terns which can reach 60cm in length. A summer visitor. It feeds mainly on fish. It has a really powerful looking large bill. It is almost gull-like in appearance due mainly to its size. This is the first I have seen which I came across at a distance in the Alvor estuary at Quinta Da Rocha in Portugal. Hoping for a better image next time!
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