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
Featherless bird-riddle Featherless bird-riddle The Featherless bird-riddle is an international riddle type about a snowflake. In the nineteenth century, it attracted considerable scholarly attention because it was seen as a possible reflex of ancient Germanic riddling, arising from magical incantations. But although the language of the riddle is reminiscent of European charms, later work, particularly by Antti Aarne, showed that it occurred widely throughout Europe─particularly central Europe─and that it is therefore an international riddle type. Archer Taylor concluded that 'the equating of a snowflake to a bird and the sun to a maiden without hands is an elementary idea that cannot yield