These are the final days of Ruby-throat migration. The last of the juveniles and late female breeders will be gone from my area in east Tennessee in a little over a week, as they move southward and eventually arrive in their wintering areas in southern Mexico and Central America.
It is pretty amazing how quickly a hummingbird's life changes from timid fledgling to sword-carrying militant. Clearly this young male is wired for survival!
More about hummingbird aggression
Bob Sargent on Ruby-throated Hummingbirds
Hummingbird Study Group
Other posts on Hummingbird migration
For the Love of It...
...the sage sees heaven reflected in Nature as in a mirror, and he pursues this Art, not for the sake of gold or silver, but for the love of the knowledge which it reveals.