Extreme Birding in Alaska
GULLS & TERNS
Slaty-backed Gull, Glaucous Gull, European Herring Gull, Long-tailed Jaeger, Sabine's Gull, Arctic Tern, Black-legged Kittiwake
Slaty-backed Gull
    Glaucous Gull
      European Herring Gull (IOU)
      Herring Gull, vega ss (AOU)
        Long-tailed Jaeger
          Sabine's Gull
            Arctic Tern
              Black-legged Kittiwakes
                Pelagic Cormorants