Sandwich Tern: a potential US first from Northumberland

Earlier in the autumn we received a very interesting report from the USA, of a ringed Sandwich Tern that really sounded like a BTO-ringed bird. Sandwich Terns aren't the commonest bird anyway in northeast USA, but interestingly in recent years most authorities have split the (Eurasian) Sandwich Tern from the (Nearctic) Cabot's Tern. The American Ornithologists' Union have yet to follow suit, but