Antarctic Shag
The only cormorant in Antarctica with its distinctive "blue eyes"
What you need to know about the Antarctic Shag
Our Expert Says… It's remarkable that these Antarctic birds emerge from the egg virtually naked. When the young feed, they push their heads so deep into the adult bird's throat that it looks like they are being swallowed. When older, nearly-fledged chicks feed this way it looks very uncomfortable for the parent!
The Antarctic Shag is the region’s only cormorant species and can be found on the Antarctic Peninsula, South Shetland Island, and Elephant Island.
There has been debate and confusion about the Antarctic Shag’s taxonomy, and it is also referred to commonly as the Blue-Eyed Shag, a group that includes the Imperial or King Cormorant (or Shag) of Patagonia and the Falklands, and the South Georgia Shags. The latest assumption is that there could be more than FOUR species of blue-eyed shags with subtle differences in plumage details. The Imperial Shag of Patagonia, the Falklands Shag (often called King Shag and still considered a sub-species of Imperial Shag in many text books), the South Georgia Shag, the Antarctic Shag, and 'Blue-eyed Shags on various islands in the southern Indian ocean.
The Antarctic shag is a black and white seabird about 75cm (30”) tall and weighing around 3kg (7lb). It has a wingspan of 1.2m (4ft) and unlike more northerly members of the cormorant and shag species, it does not spread out its wings to dry them in the iconic cormorant pose. This is because the Antarctic shag has extremely dense under-feathers that form a waterproof barrier, meaning it doesn’t need to dry off in between fishing trips, nor does it have to expose itself to cold Antarctic temperatures.
All Antarctic shags have a “blue eye” - hence one of the popular terms Blue-Eyed Shag - which isn’t actually their eye at all! This is blue-colored skin that surrounds the eye, and together with the yellow wart-like growth on the birds’ forehead forms the two main identifying traits of the species.
Antarctic shags don’t migrate and stay in their habitats all year round. They are often found close to pack ice in colonies. During the breeding season, they build cone-shaped nests that look like miniature volcanoes out of feathers, seaweed, and general beach debris, all glued together with their guano. Parents take turns to incubate the two or three eggs that are the usual brood size, then the female takes over keeping the near-naked chicks warm until their feathers come in. The male then forages for the food.
When it comes to food, Antarctic shags are divers, using their webbed feet for propulsion, and generally, they’ll go down around 80ft beneath the surface to hunt for their prey, which is mainly fish and small crustaceans.
There are thought to be around 20,000 individuals that make up the Antarctic shag population, and they are currently not under threat.
Antarctic Shag: Interesting facts
Blue-eyed Shags spend a lot of time lot of time grooming each other. They use seaweed to make the nest and usually lay 2 to 3 eggs. Incredibly, especially for the Antarctic 'blue-eyed' shags, the chicks are naked when they hatch!
'Chicks' that are about to fledge (they are the size of the adults) spend a lot of time flapping to strengthen the wing muscles. Once one or two take the maiden flight, the rest seem to get the right idea and a whole group can suddenly take off, often crashing onto the sea or onto rocks. At this time they can be inquisitive, even landing on Zodiacs and kayaks, but they are also very prone to predators, skuas often ganging up to drown isolated birds.