Northern rockhopper penguin been caused by a vicariant event caused by a shift in the position of the Subtropical Front during the mid-Pleistocene climate transition. Analysis of a part of a mitochondrial control region from a northern rockhopper penguin found on the Kerguelen Islands showed that it may have come from Gough Island, 6,000 km away, and that the southern and northern rockhoppers are genetically separate, though some individuals may disperse from their breeding colonies. Many taxonomists have yet to recognize the split, although some are beginning to do so. More than 99% of northern rockhoppers breed on Tristan da Cunha and Gough
The Bird 'Grip' ever after. While the hero in these stories is normally aided by a talking animal, for it to be a ghost is unusual. This is the grateful dead, a common folklore motif, found also in "Fair Brow". The Bird 'Grip' The Bird 'Grip' is a Swedish fairy tale. Andrew Lang included it "The Pink Fairy Book". It is Aarne-Thompson type 550, the quest for the golden bird/firebird; other tales of this type include "The Golden Bird", "The Greek Princess and the Young Gardener", "How Ian Direach got the Blue Falcon", "The Nunda, Eater of People", and "Tsarevitch Ivan, the Fire