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 pie well known, filled with pigeon meat and truffles, comes from Ferrara, while also Rome (whose "pasticcio", filled with chicken innards and topped with cream, has a clear Renaissance origin) Naples and Sicily have their own version. In Scotland, macaroni pie is prepared by filling a Scotch pie shell with macaroni and cheese and baking it. Greggs previously sold it in Scotland, but stopped doing so in June 2015, which spurred an online campaign and petition for the company to return the dish. Several prominent Scottish politicians signed the petition, including Nicola Sturgeon, Ruth Davidson and Kezia Dugdale. In the United