Arctic terns are perhaps the epitome of migrating birds. They are a circumpolar species and each year travel from pole to pole to take advantage of a double summer. Populations winter in the Antarctic and then travel back 12,000 miles, at a minimum. Average migrations are around 30,000 miles. One bird was recorded as flying 57,000 miles in the course of migrating to and foraging in Antarctica. In the UK, the arctic tern is a summer visitor, arriving from the end of April until October.
For more information on Arctic tern migration, check out this guide.