Tweets,

a couple of weeks ago, I heard the leader to a piece on NPR, the gist of
which was that birds are good indicators of global warming; i.e., as the
climate warms, birds will find suitable habitat in more northerly areas
that would previously have been inhospitable. This may help explain the
northward range expansion of scrub jays and grackles, for instance, and
maybe such oddities as little blue herons in the Bay Area, or summer
tanagers in Sacramento. I didn't, unfortunately, hear the whole piece,
which typically would have included someone with an opposing or alternate
viewpoint. Anyone have any critiques of this theory? Know of any published
references on this topic? Thanks...

Rob Saecker
Olympia