Birds drinking the sap of a birch tree.--On 13th April 1958 I was watching a Marsh Tit (Parus falusiris) feeding at the edge of a deciduous wood at Minsmere in Suffolk when I noticed it return several times to the same place on a tree. At first I thought it was taking insects, but then I realized that the bird was drinking the sap oozing out of a broken twig. Three times the bird flew off to feed ...

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