I doubt that individual pairs breed twice a year AND migrate twice a
year, but recently a small number of Barn Swallows have been nesting on
their Argentine wintering grounds.
--- Barb Wilson

On Sat, 20 Jan 1996 bharrison at macnet.com wrote:

> All,
> Conceivably a bird species that migrates far enough across the
> equator could be leaving in our late summer or early fall and arriving in
> the southern hemisphere in their early spring just in time to raise a
> clockwise brood down south. Then, just when the empty nest funk begins in
> their late summer or early fall, off they go again to the north for a
> counter-clockwise affair. Do any migratory species actually raise two
> broods a year, one there and one here?
>
> Bruce Harrison
> McMinnville, Oregon
>