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SOF-BirdLife
Collins Bird Guide
NatureGuides Ltd
Birds of Europe Field Guide
Ecosystema
Birdie Memory
Merle Blanc
European Birds Songs & Calls
BirdNET
Stefan Kahl
Picture Bird - 撮ったら、判る-1秒鳥図鑑
Next Vision Limited
OrnitO
Dominik M. Ramík
Merlin Bird ID by Cornell Lab
Cornell Lab of Ornithology
Bird Decoys: Songs and Calls