Letters

01 July 1978 Comments Letters Diving methods of Great Northern and Black-throated Divers On inland waters, I have noticed that Great Northern Divers Gavia immer always slither under slowly when diving, whereas Black-throated G. arctica jump upwards slightly before they dive...
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Letters

01 June 1955 Comments Letters Uses of photography and sound-recording to reinforce sight records of unusual birds Sirs,--Your editorial on sight records of unusual birds (Brit. Birds, 55: 557-560), though comprehensive, omits reference to the value of reinforcing such records by photo...
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