I looked at my photos of that Sandwich Tern, Colorado's only state record,
and I see the differences between the American and Eurasian subspecies.
that Sibley's article shows well. I agree the Colorado bird would be the
Eurasian subspecies, very interesting! We do get some crazy birds in
Colorado
CO birders :
There is an excellent article by David Sibley on Sandwich Tern identification
in North American Birds volume 74 number 1 2023 which identifies the Manitou
Lake bird as being of the European subspecies Thalasseus
sandvincensis.Currently AOU and Clements do not split Sandwich Tern in
