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
Blue Bird Mini Bird P30 step-van chassis and was initially available only with a gasoline engine. In the 1980s, diesel engines (the Chevrolet 6.2L) became an option. In the 1990s, the 6.2L diesel V8 was replaced with a more powerful 6.5L diesel. Unlike other models in the Blue Bird lineup, the Mini Bird was not assembled in Fort Valley, Georgia. Assembly of the Mini Bird took place in Buena Vista, Virginia (Blue Bird East; which closed in 1992) and in Mount Pleasant, Iowa (Blue Bird Midwest, which closed in 2002). Blue Bird Mini Bird The Blue Bird Mini Bird was a Type B school