Exploring the secret life of house sparrows with the aid of a 3-D printer

Since it was introduced to North America in the late 19th century, the house sparrow has received little love. "Nothing can be urged in its favor," declared an 1891 editorial in the New York Times. A few years later, the same newspaper deemed the birds "rats in the air." Adding insult to injury, the International Union for Conservation of Nature has long kept the house sparrow on its unceremonious list of species of "least concern."

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