Late July is somewhat of a lull when it comes to the world of backyard birds: summer migrants have become old news, fall migrants are still months away and the flood of baby birds encountered in early summer has slowed to a trickle. That means that now is a good time to appreciate the birds that are always here, and few are as ever-present as the towhees, the two large members of the sparrow family that form a regular part of the neighborhood scene all year round. Both are engaging and well worth knowing...