Partial albinism of Manx Shearwaters, The note on leucism and partial albinism of Manx Shearwaters Puffinus puffinus (Brit. Birds 81 : 235-236) recalled the following. On 18th June 1972, in the Strait of Gibraltar, I observed a flock of about 160 Manx Shearwaters of the race mauretanicus: one had an almost white rump and crown, while its mantle and upperwing-coverts were streaked white. On 23

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