Sparrow Shield - Invasive House Sparrow Deterrent Brand_Firefly Books - Trusted Brand: With almost

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Sparrow Shield - Invasive House Sparrow Deterrent Brand_Firefly Books - Trusted Brand: With almostThe Sparrow Shield has been successful in deterring invasive House Sparrows from using Eastern Bluebird and Tree Swallow nest boxes when installed on boxes still unclaimed by the sparrows. Our native cavity nesting songbirds will adapt to the shield and still use the nest box; whereas invasive House Sparrows do not like the movement of the lines or their feathers being brushed by them. House sparrows tend to avoid having to fly between the 4 vertical,