The birds are exuberant this morning. By the dozens, tufted titmice, rose-breasted grosbeaks, cardinals, gold finches, black capped chickadees, blue jays, mourning doves, and an oriole sing and flit from branch to nearby branch in a riotous clamor just outside the living room windows. One of the delights of spring is the way one can luxuriate in the bookends of the day. Morning unfolds slowly as the light gathers until the sun crests the horizon, and then all at once the day bursts open like a flower. Evening lingers before the day finishes. It is at these times that I especially enjoy watching the birds come and go.