Spectacled tern Spectacled tern The spectacled tern ("Onychoprion lunatus"), also known as the grey-backed tern, is a seabird in the family Laridae. A close relative of the bridled and sooty terns (with which it is sometimes confused), the spectacled tern is less common than the other members of its genus and it has been studied less. The three species, along with the Aleutian tern were recently split into a new genus "Onychoprion" from "Sterna" (Bridge "et al.", 2005). They resemble the sooty tern but with a grey back instead of a black one. Their breast and underparts are white, and they have
SY Tern crank compression expansion engines providing 200 bhp to a twin screw propeller. She carried two masts and had an open navigating platform set forward of her amidships single funnel. She was also designed with a distinctive canoe-shaped bow. "Tern" has spent her whole active life operating on Windermere. She was caught in a severe storm while at Lakeside in November 1893 and sank at her moorings, but was refloated that night. In 1923 Furness Railway was absorbed into the London, Midland and Scottish Railway, as part of the measures of the Railways Act 1921, with "Tern" continuing to sail for