Tern make up the clutch. Most species feed on fish caught by diving from flight, but the marsh terns are insect-eaters, and some large terns will supplement their diet with small land vertebrates. Many terns are long-distance migrants, and the Arctic tern may see more daylight in a year than any other animal. Terns are long-lived birds and are relatively free from natural predators and parasites; most species are declining in numbers due directly or indirectly to human activities, including habitat loss, pollution, disturbance, and predation by introduced mammals. The Chinese crested tern is in a critical situation and three other
Whiskered tern Whiskered tern The whiskered tern ("Chlidonias hybrida") is a tern in the family Laridae. The genus name is from Ancient Greek "khelidonios", "swallow-like", from "khelidon", "swallow". The specific "hybridus" is Latin for "hybrid"; Pallas thought it might be a hybrid of white-winged black tern and common tern, writing ""Sterna fissipes ["Chlidonias leucopterus"] et Hirundine ["Sterna hirundo"] natam"”. This bird has a number of geographical races, differing mainly in size and minor plumage details. "C. h. hybrida" breeds in warmer parts of Europe and Asia. The smaller-billed and darker "C. h. delalandii" is found in east and south Africa, and the