(Plates 61-64). T H E Caspian Tern (Hydroprogne caspia) is perhaps the most impressive of all the terns on account of its large size, approaching: that of the Herring Gull (Larus argentatus), and because of its massive, shining orange-red bill, of which a very good impression is given by plate 6 1 . This plate also shows the typical tern summer colouring of grey and white with a black cap which, h...

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