In the right weather conditions best looked for from Sheringham, Cley or Holme in early autumn. This can be a very tricky species to identify, exercise extreme caution. Here are some ID tips. From the flight shot you can clearly see the cold grey/white ground colour of the bird, usually a warmer brown colour on Arctic Skua, this is most obvious on the barred rump. Note the long attenuated rear end, which is longer than the wing base is wide. Upper wing - white feather shafts on only the outer two most primary feathers, most Arctic Skuas show a more extensive flash. Note the long slender sickle shaped wings. Bill structure - fairly short thick bill which is at least half tipped black, Arctic have a longer slender bill with more restricted black tip. Behaviour wise LTS very rarely chase other birds they are more likely to dip feed on the surface of the water like a tern.