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
White-fronted tern have also bred on islands in Bass Strait, north of Tasmania. Many of the birds winter in south-eastern Australia, especially juveniles. White-fronted tern The white-fronted tern ("Sterna striata") is the most common tern of New Zealand. It rarely swims, apart from bathing, despite having webbed feet. The species is protected. White-fronted terns feed in large flocks by plunge diving on shoals of smelt and pilchards which have been driven to the surface by larger fish and are easily caught. Like all terns they fly with their heads and bills pointing down to see their prey. Breeding is between October and