On Tue, 20 Jun 1995, Dennis Paulson wrote:

> Or "prebreeding"and "postbreeding" migration, and then its direction or its
> season wouldn't matter one whit (speaking of Swainson's Thrushes).

This statement brings to mind a question I've been wanting to ask. How
many migrants fly south to another breeding season? Seems possible that
a bird could fly back and forth across the equator and experience two
springs and summers a year.