Sarah Anderson wrote:

> Do the females & juveniles sort of group
> together and migrate in advance of / separately
> from the males?

The adult males migrate first. Most of them are 
already gone.

Hummingbirds do not "flock up" to migrate. They 
migrate individually but are attracted to the same 
stop over points, so it might seem that a group 
arrive or leave at the same time.

Les

===========
Les Eastman
mailto:[log in to unmask]
Havre de Grace, MD

The eagle looked down on the river below
And he wrapped his wings round him and he fell
like a stone
And the big salmon fought but the talons held true
And he shuddered as the world turned from silver
to blue
                               Steve Earle