Birds of Europe Field Guide
Ecosystema
Collins Bird Guide
NatureGuides Ltd
European Birds Songs & Calls
Merlin Bird ID by Cornell Lab
Cornell Lab of Ornithology
BirdNET
Stefan Kahl
Idle Bird Park
Zepni Ltd.
Birdie Memory
Merle Blanc
Birds Revenge: 플라잉 & 버드 게임
Ganza Games
Bird Kind
Runaway Play
앵그리버드2
Rovio Entertainment Corporation