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Shag Phalacrocorax aristotelis L 65-80cm. Smaller than Cormorant, with more slender bill. Leaps in order to submerge. Often perches with wings held outstretched. Sexes are similar. Adult is all-dark but with oily green sheen. Has yellow patch at base of bill and distinct crest. In winter, loses crest; colours at base of bill are subdued. Juvenile has dark brown upperparts and buffish underparts and pale throat. Crown peaks on forehead (peaks on rear of crown in juvenile Cormorant). Voice Silent except at nest. Status Locally common on rocky coasts. Nests colonially on sea cliffs.