Mama tree swallow taking a break. Thenest buildinghas been going at a fevered pitch over the past three days. We took a peek in the box yesterday afternoon and we believe the nest is almost done. As for the house sparrow, so far so good. We haven't seen it around the birdhouse since the incident. The mama will be vulnerable to attack when she lays her eggs and spends more time on the nest. We're doing all we can to see that it doesn't happen again.