Links:
| managing parties and sponsors | colour-ringing | metal rings |
| Alterra | CR-birding | GRIEL |
| SOVON | Ringmerkning.no | EURING |
| NIOO | ||
| Vogeltrekstation | waarneming.nl | |
| DCE | blessgans.de | |
| Faunafonds | Wildfowl & Wetlands Trust | |
| Altenburg & Wymenga |
Links:
| managing parties and sponsors | colour-ringing | metal rings |
| Alterra | CR-birding | GRIEL |
| SOVON | Ringmerkning.no | EURING |
| NIOO | ||
| Vogeltrekstation | waarneming.nl | |
| DCE | blessgans.de | |
| Faunafonds | Wildfowl & Wetlands Trust | |
| Altenburg & Wymenga |