Black Tern
| Gender | undetermined |
| Age | adult |
| Plumage | breeding plumage |
| Recorded | 2015-05-26 |
| Location | Donaudelta, RO |
| Copyright | Beat Rüegger |
| Gender | undetermined |
| Age | 1st calendar year |
| Plumage | juvenile plumage |
| Recorded | 2007-07-26 |
| Location | Bishkek, Kirgistan |
| Copyright | Beat Rüegger |
| Family | Terns |
| Status CH | regular migrant |
| References | en.wikipedia.org |
| vogelwarte.ch |
4 | 5