The genus Sterna now contains a group of medium sized white terns that live in coastal waters.
The members of the genus Sterna are generally white, with black caps on the head. Most of them are plunge feeders, a dramatic site as they dive head-first in the sea. Most migrate, in some cases for massive distances. The Arctic Tern is the most impressive in that respect.
Like many genera there is currently much debate about the members of Sterna. Currently the RSPB and British Bird List place the Sandwich Tern in this genus as Sterna Sandvicensis, but other sources place it in the genus Thalasseus (crested terns).
The genus also used to contain the seven species currently in the genus Sternula (small white terns), but these are generally now considered to be a separate genus.
Order: Charadriiformes (Gulls, terns, plovers etc)
Number of Species: at least 13 (as of May 2015)
British Members of the Genus