Macaroni penguin been considered separate species, but the close similarities of their DNA sequences has led some, such as the Australian ornithologists Les Christidis and Walter Boles, to treat the royal as a subspecies of the macaroni. The two species are very similar in appearance; the royal penguin has a white face instead of the usually black face of the macaroni. Interbreeding with the Indo-Pacific subspecies of the southern rockhopper penguin ("E. chrysocome filholi") has been reported at Heard and Marion Islands, with three hybrids recorded there by a 1987–88 Australian National Antarctic Research Expedition. The macaroni penguin is a large, crested
Macaroni and cheese of the main ingredients made the dish affordable, and recipes made it accessible, but not notably popular. As it became accessible to a broader section of society, macaroni and cheese lost its upper class appeal. Macaroni and Cheese was brought to Canada by British immigrants, coming from other parts of the British Empire. Macaroni and cheese recipes have been attested in Canada since at least "Modern Practical Cookery" in 1845, which suggests a puff pastry lining (suggesting upper-class refinement); a sauce of cream, egg yolks, mace, and mustard; and grated Parmesan or Cheshire cheese on top. Canadian Cheddar cheese was