The red knot is an ordinary looking shorebird that flies each year from the Arctic to South America and back - a trip that over the course of a bird's lifetime would be as far as the moon. To learn more about the birds, wildlife biologists have been banding them for a number of years in the United States, Chile and Argentina. One of the birds surveyed on Kiawah Island earlier this week had three bands on its legs - each of them old enough that it is no longer in use. The red knot has been proposed for the federal Endangered Species list. Learn more about the work federal and state biologists do to manage species on that list - and why - in Sunday's Post and Courier.