Date: 6/22/25 8:41 pm From: Allan Mueller <akcmueller...> Subject: Re: Barn Swallow cooperative breeding
In BOTW read the last paragraph of "Breeding Range". The breeding Barn
Swallows in Argentina breed during the Boreal Winter (Dec-Feb). During the
Austral Winter (June-Aug) they only migrate as far north as northern South
America, but do not breed there. Still a recent and amazing event.
Allan
On Sun, Jun 22, 2025 at 9:05 PM Ian MacGregor <
<00000489141846bd-dmarc-request...> wrote:
> I think non-subscribers to the Birds of the World website can see the
> range maps. Surprisingly there’s a section of Argentina where they
> breed. These birds are breeding twice a year, once somewhere in their
> normal breeding range and again in Argentina.
>
> Ian MacGregor Bella Vists
> On Sun, Jun 22, 2025 at 6:23 PM, Ragupathy Kannan <
> <0000013b0ad14faf-dmarc-request...>
> <On+Sun,+Jun+22,+2025+at+6:23+PM,+Ragupathy+Kannan+%3C%3Ca+href=>> wrote:
>
> You learn something new everyday. Today I learned that Barn Swallows can
> breed cooperatively.
>
> It started when I observed 3 adults building a nest in my porch. I looked
> up Birds of the World.
>
> So, yes, a nonparent adult can help a pair build a nest and attend to
> other chores.
>
> But before you go "awww"--it becomes sinister the more you dig into it.
>
> Some male helpers kill nestlings to induce divorce among the parents.
> They then take over the brooding female.
>
> As I often tell my ornithology students, DNA evidence has unearthed a lot
> of "dirty laundry" in the bird world.
>
> For more on this, click here
> <https://birdsoftheworld.org/bow/species/barswa/cur/breeding#coopbr>.
>
> Kannan
> Ft. Smith
>
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--
Allan Mueller (It)
20 Moseley Lane, Conway, AR
Home of the Arkansas State Champion Winged Elm
501-339-8071
*BLOG* birdsnonsense.blogspot.com
Pura Vida
