Previously considered a sub-species within the same genus as Southern Giant Petrel, they were split out in the 1960s. The Northern has a red-nosed bill while the Southern has green. The Northern also has a dark and light morph as you can see from my pics below. We saw these all over the Beagle Channel, across the Drake and in Antarctica. They have a devious and smart look to them.
Some of them looked kind of goofy and Gonzo-like with the bulbous red-tipped nose.
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