Blackbirds swoop & zoom across the green spread of Spring, sparring like old war planes ready to dive-bomb, then, lifting out of free-fall, they rise triumphant to land in the topmost branches of a wall of trees - sentinels of summer-to-come - to catch their wings, then launch out again into shivering air to an acrobatic duel; precursor to finding a partner & the rigors of nest building, brooding speckled eggs of cerulean blue, raising demanding young grey-feathered with fluff, growing until nest becomes a world too small' for lives meant to soar.