Every species and group logged from the roof of the AIIB headquarters, 18 July – 10 November 2022. Search by any name, sort by volume or alphabetically, and tap one of the seven headline species to see its nightly call-volume graph and how 2022 compared with 2021.
Counts are of individual flight calls logged, not numbers of birds (one bird may call many times as it passes). "Sp." entries are calls identified only to genus or group — chiefly buntings, flycatchers, white-eyes, thrushes and geese — which cannot reliably be told apart by call. Tap any of the seven headline species (Olive-backed Pipit, Red-rumped Swallow, Black-crowned Night Heron, Common Rosefinch, Eurasian Skylark, Little Bunting and Brambling) for its nightly call-volume graph. Data: Wild Beijing nocturnal migration project, autumn 2022.