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
Peruvian tern years, they are also absent from the shore, do not make any attempt to breed and probably remain at sea. The total number of Peruvian terns is estimated to be in the range 1,000 to 2,499 individuals. The number seems to be declining, and in 2007 it was suggested that there were only half as many birds as there had been ten years earlier. Because of the small population size and the decrease in numbers of individuals, BirdLife International has assessed the bird's conservation status as being "endangered". Peruvian tern The Peruvian tern ("Sternula lorata") is a species of tern