On Mon, 27 Feb 2012 09:19:38 -0800
James Tyler Bell <> wrote:

> The interesting thing about the Common Raven expansion is that
> they're well south of DC but the Potomac seems to be stopping them
> from moving into Charles and St. Mary's. Look at the eBird
> distribution map to see this clearly. Presumably they'll move into
> southern Anne Arundel and northern Calvert at some point.

Tyler,

Even though the part of Virginia that Ravens call home extends south of
AA county, most of that range is also above the fall line, which is
probably important than the river for limiting the range.

Dave

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