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In 1867, Canterbury released 40 house sparrows to eat crop pests; within 15 years New Zealand was poisoning the birds and paying bounties after they began stripping grain crops - The Times of India
The house sparrow was brought to New Zealand in 1867 to help farmers deal with crop-eating insects, but the small bird soon became a problem of its own. Within a few years, while it grew in numbers, it also began damaging crops, leading farmers and authorities to turn against the species.