Subject: Re: vagrancy
Date: Dec 14 17:06:10 1995
From: Eugene Hunn - hunn at u.washington.edu


You don't count range extensions with leapfrogging such as our
Black-throated Sparrows and Arctic Terns?

Gene.

On Thu, 14 Dec 1995, Dennis Paulson wrote:

> Stuart wrote:
>
> "In South Africa both swallow and common sandpiper (similar to spotted
> sandpiper) have started breeding - this is only 6,000 miles outwith their
> normal breeding range !!! They do winter there however."
>
> Interesting that he mentions the very examples I could find when I looked
> in the literature--probably 20 years ago. I believe Barn Swallows have
> been found breeding sparingly in Argentina now, obviously a good example of
> this potential. But as Stuart said, this is in their winter range, and
> they only have to fail to migrate to form a breeding population. Northern
> Parulas have nested successfully in California, as a good example; however,
> this never produced a lasting breeding population. This is still a *very
> unlikely* event in the bird world, from what we know today.
>
> Dennis Paulson, Director phone: (206) 756-3798
> Slater Museum of Natural History fax: (206) 756-3352
> University of Puget Sound e-mail: dpaulson at ups.edu
> Tacoma, WA 98416
>
>
>