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18â€“20 cm (7-7Â¾ in)
Juvenile: dark overall plumage, lacks crest (or it is at least reduced), bill dark, eye not pale.
Open sea; breeds on remote islands among boulders and on scree slopes.
The diet includes plankton, fish and krill.
Colonial nesters. A single egg is laid in the rocks and is incubated for 4 weeks. A month later, the young will fledge.
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