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Imperial Shag (Phalacrocorax Atriceps), Antarctic Peninsula
The Imperial Shag, otherwise known as the Imperial Cormorant, hunts in 'rafts', or large groups of hundreds which dive down together in "pursuit-diving" of fish, at up to 25 metres depth.
Given that the Imperial Shag has a small range and is usually found in small populations, pollution or chance extreme weather events can threaten a whole colony.