By July, most of our backyard nesters are finished, or almost finished raising their young. Not the prolific and energetic little house wren. This little guy sometimes raises three broods or more! He sings his bubbly cheerful song all day long. House wrens nest in cavities so they really like nest boxes. The are aggressive competitors for nest sites. A male often fills every available box with his nesting material of choice…. small sticks! Its entertaining to watch him carry little twigs and carefully insert them into the birdhouse.By July, most of our backyard nesters are finished, or almost finished raising their young. Not the prolific and energetic little house wren. This little guy sometimes raises three broods or more! He sings his bubbly cheerful song all day long. House wrens nest in cavities so they really like nest boxes. The are aggressive competitors for nest sites. A male often fills every available box with his nesting material of choice…. small sticks! Its entertaining to watch him carry little twigs and carefully insert them into the birdhouse.