For a couple of days, we've been watching this busy little duo from the patio. This morning I had time to snap a few photos and identify the species. The mother was so tiny and sprightly that I had assumed she was a wren when in fact, she was a chipping sparrow, but the baby was a puzzle - he was way too big to be hers! So I did some investigating and found that brown-headed cowbirds are brood parasites, laying their eggs in other bird's nests. The chicks monopolize the parent's feeding and grow faster than their nestmates. I'm pretty sure that's the scenario we have here. 
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