David Mozurkewich wrote:

> Bob,
>
> Thanks.  That's pretty much exactly the answer I was expecting: more
> observations are filling in the wings of the distribution.
>
> But I wonder if we can rule out the other possibility -- that the wings of
> the distribution are getting larger.  More weird weather combined with
> less-suitable nesting habitat could result in more failed nests or more
> non-nesting adults.  These birds may be heading south earlier in the
> season.
>
> Dave
> David Mozurkewich
> Seabrook, PG MD USA
> mozurk @ bellAtlantic.net
>

Or... fall migration is earlier because spring arrival dates are earlier.
--
Fred Fallon
Bowie MD