Since I first started putting up bluebird nesting boxes back in 2016, I have had to think about a much less-beloved bird, the house sparrow, that also loves nesting in these boxes. House sparrows are ...
The house sparrow is about 15 centimeters long and weighs about 25–35 grams. It has brown and black striped upperparts and gray undersides. The male has a black throat patch and gray skullcap, while ...
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