Wren eggs are incubated by both the male and female and hatch quickly. I learned my lesson: Listen to the wren.' 'So, we quickly installed another nest box and took down the shirt before the eggs were placed in the pocket. 'Thinking ahead, I could imagine a rain storm that would drench the nest and nestlings or eggs, as the top was open to the elements, and that would be a disaster,' Barb said. Before Barb knew it, the pocket of one of her husband's old work shirts that was hanging on the clothes line was filled with sticks – the beginnings of a wren's nest. One year, she was late in cleaning out a nest box and a mother wren didn't have enough room to lay her eggs. The boxes can also be taken down and painted inside and outside with a child-safe paint to further eliminate parasites and provide a clean nesting site in spring.īarb has seen first-hand how demanding wrens can be for nesting materials once they become familiar with humans. As they tend to nest in the same box year after year, the boxes should be cleaned out annually, according to Barb and Joe Rogers, who operate Wildlife Recovery Association and Little Swamp Sanctuary. The wrens will pack the box with sticks and line the nest with soft feathers. Nest boxes at Little Swamp Sanctuary have provided homes for generations of wren families.

But the entrance also needs to be big enough for young wrens to exit the box fledglings are often bigger than the adults. A small entrance can protect these tiny garden birds from predators. If a wren can put its head through the hole, it's big enough for the bird to squeeze in its whole body. These birds also like to use small nesting boxes – with a base of about 4x5 inches and an opening of 1 1/4 inches – for their homes.

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