Northern rockhopper penguin colonies in a range of locations from sea level or on cliff sides, to sometimes inland. The Northern form, found in Amsterdam and Gough island, is reproductively isolated from the Crozet and Kerguelen islands. They are monophyletic; meaning they have a split in the mitochondria DNA trees which forms two subspecies: the northern and southern rockhopper penguin. Another interesting difference between the two subspecies is their mating ritual. They both use different songs and head ornaments in their mating signals. The reproductive isolation has led to not only physical difference but also behavioral. The adults feed their chicks lower trophic
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