The Inca tern is a Near Threatened species of bird in subfamily Sterninae of the family Laridae, the gulls, terns, and skimmers. mostly dark slate gray body with a paler throat and underwing coverts. A white stripe extends back from the base of the bill and fans out as long satiny feathers along the side of the neck, looking like a big mustache. The Inca tern feeds primarily on small fish. Is a cliche detective, sporting a big white mustache.