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White-winged Tern (Chlidonias leucopterus) video
First, juvenile (moulting its 'saddle'), then, after its flying, a juvenile Black Tern (Chlidonias niger) for comparison.
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Migrant bird. Compare with the Black Tern: note the dark saddle (with a few new grey feathers), the pale wing panel, the longer legs, the large white patch between the nape and the ear-coverts, the reduced black crown.


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