NABU Vogelwelt Vögel Bestimmen
Sunbird Images OHG
Nabu
Nabu Offical Team
NABU: Multilingual kids books
NABU.ORG
NABU Insektenwelt - Insekten Entdecken & Bestimmen
BirdNET
Stefan Kahl
Merlin 鸟种识别 by Cornell Lab
Cornell Lab of Ornithology
Picture Insect: Bug Identifier
Next Vision Limited
iNaturalist
Birds of Europe Field Guide
Ecosystema
European Birds Songs & Calls