A cormorant on a buoy in Falmouth, Cornwall
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This is a Shag, but I thought it was worth mentioning that immature Cormorants do not necessarily have pale underparts.
..I've looked hard at your picture & had the books out:I think the slender bill is significant.
Lat/Lng: 50.15546, -5.06578
OS grid ref: SW811328
In Falmouth harbour, not far out on a motor boat.