Where are the starlings?

First off, I don't miss Sturnus vulgaris.  The starling is a real pest in most parts of the year but fortunately they seem to take a vacation starting in Fall.  I wonder if we could find out what cues make them leave or migrate and then use that to give them the hint that they are not wanted during the Spring and Summer?  They normally roost in large flocks in the maple trees that overhang our cars in the driveway and you can imagine what the result is.

Instead of starlings at this time of the year, I see several blue jays in the yard, along with sparrows and wrens.  At the pond there are still huge flocks of Canada geese, a few ducks and lots of gulls (that seems strange).

Birds unraveling window screens in grove city, ohio

I recently visited my brother in Grove City, Ohio.  When I entered his house I noticed a window screen laid out on a table for repair. It seems that the birds have learned how to unravel window screens!  I wonder if this is a local, learned behavior or if it occurs in other parts of the world?