I wouldn't be in a hurry to call a peregrine "tundrias" based on the
drawings in Sibley's book. For one thing anatum is not even shown and many
of our local (and northern migrant) anatums are quite pale. Tundra
peregrines generally winter south of the U.S. although there are a few
records for B.C. and Washington in winter based on banded birds of known
natal origin. Sibley also shows juvenile peregrines with yellow feet which
is unusual. Most young peregrines have bluish grey soft parts (cere,
orbital and feet). A mid sized brown falcon with yellow feet would more
likely be an adult prairie.
I've noticed a remarkable increase in the number reports of tundrias since
the release of Sibley's book. Sub species of raptors often can't be
distinguished in the field.
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