Duration of dives of Black-throated Diver.--In Sutherland on -25th May 1955 we were able to make continuous observations for nearly four hours on the diving of a Black-throated Diver (Gavia arctica). T h e site was a loch half a mile wide and seven miles long-. The bird, one of a pair, was first seen at 12.45 P-m. as it made its way up the loch by a series of long dives. Our subsequent observation...

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