The Heard Island Cormorant or Shag was first described as the subspecies nivalis of the Imperial Cormorant or Blue-eyed

Higgins (1990) recognise five distinct species within this P.

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Other Authors: The Pennsylvania State University CiteSeerX Archives
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Language:English
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Online Access:http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.670.81
http://marineornithology.org/PDF/26/26_11.pdf
Description
Summary:Higgins (1990) recognise five distinct species within this P.