>From: Burton Guttman[SMTP:guttmanb at elwha.evergreen.edu]
>Anyway, the related interesting question is about birds. Many species
>are changing their ranges, and there's a lot of historical information
>about just what changes have been occurring. Has anyone studied these
>changes to see if there's an overall northward trend in the Northern
>Hemisphere?

I don't know about studies, but I do know that on the East coast,
several prominent species have moved northward over the last 30 years.
These include Northern Cardinal, Northern Mockingbird, and Tufted
Titmouse.

However, as Mr. Guttman implies, we need a study which looks at many
species, to see if these three represent a trend, or if they are just
part of the normal shifting of ranges.

It would also be interesting to see if the southern extent of the ranges
is also moving north.


== Michael Hobbs
== Redmond WA
== mikeho at microsoft.com