I think it's absurd to assert that Anna's Hummingbirds "do not
migrate", unless one ONLY means a normal pattern of moving from one
area to another... but I would contend that some areas see an influx
of ANHU in the fall and winter due to what (with Robins at least) was
and always has been called "local" or "regional migration"... The
term "migration" does NOT just mean "heading south of the border"!
How else did Dan Casey get one in Somers Montana a month or so ago
[many observers and photos], and how else do they get to places like
the Bitterroot Valley in Montana, or for that matter the eastern
states? Just a question, and not at all intending to disrespect
anyone... - Jim Greaves, Thompson Falls MT