Arctic Tern vs Antarctic Tern

The Arctic Tern and Antarctic Tern are similar in appearance, but can be distinguished by their size, plumage details, and migration patterns. Arctic Terns are generally smaller and have a more delicate build compared to the larger Antarctic Terns. Observing their behavior and habitat can also provide clues for identification.

Size and build: Look for the smaller, more delicate Arctic Tern versus the larger Antarctic Tern. Tail streamers: Arctic Terns have longer tail streamers. Migration patterns: Arctic Terns migrate between polar regions, while Antarctic Terns may be resident or migrate within the Southern Hemisphere. Plumage variation: Be cautious of immature Antarctic Terns resembling winter Arctic Terns.

Arctic Tern is smaller and more slender compared to the larger and bulkier Antarctic Tern.

Arctic Terns have a more uniform grey body with a longer tail streamers, while Antarctic Terns may show more variation in plumage and have shorter tail streamers. Immature Antarctic Terns can resemble winter plumages of Arctic Terns, complicating identification.

Arctic Terns are known for their long migrations between polar regions, while some Antarctic Tern populations are resident and others are migratory, often wintering in southern South Africa.

Arctic Terns breed in the Arctic and sub-Arctic regions, while Antarctic Terns are found in circumpolar regions of the Southern Hemisphere, with some populations migrating to the Atlantic coast.