Closely related bird species occurring in different continents are always a special challenge for keen birders. It is not too long ago, that ornithologists found out, that a Least Tern (Sterna antillarum) was found in East Sussex. This was new to Britain and the Western Palearctic. Also on other sites along the western coast of Europe and Great Britain, you might have chances to see (and compare) 2 small terns of the genus Sternula. Sternula is a genus of small white terns, which is often subsumed into the larger genus Sterna. Least Tern was formerly considered to be subspecies of Little Tern but is now regarded a valid species besides the Little Tern, Sternula or Sterna albifrons.
In the case of a small Tern in East Sussex, a Little Tern, Sternula albifrons, with a distinctive Continue reading Least Tern for the Western Palearctic