Birds of Europe Field Guide
Ecosystema
Collins Bird Guide
NatureGuides Ltd
European Birds Songs & Calls
Bird Life
Cross Field Inc.
Merlin Bird ID by Cornell Lab
Cornell Lab of Ornithology
Idle Bird Park
Zepni Ltd.
BirdNET
Stefan Kahl
Birdie Memory
Merle Blanc
Bird Kind
Runaway Play
Bird Decoys: Songs and Calls