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
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