species 19,788 observations
Black Tern
Chlidonias niger
Field notes
The black tern (Chlidonias niger) is a small tern generally found in or near inland water that breeds in Europe, Western Asia and North America. In winter the birds migrate to coastal areas of Africa and South America.
Read more on WikipediaRange
Greener is more native, amber more introduced; paler is less certain. How this was decided