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On an unusually balmy day in December, Koichi Karasawa and 53 volunteers for the Urban Bird Society of Japan gathered for their eighth survey of Tokyo’s crow population.

Equipped with binoculars and notebooks, the party split into smaller groups to observe the number of avian pests roosting at Meiji Shrine, Toshimagaoka Cemetery and the Institute for Nature Study botanical gardens — all located within the capital’s 23 wards. By nightfall, they had counted 2,785 — the lowest figure tallied since the research project commenced in 1985.

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