Macaroni penguin female are similar in appearance; males tend to be slightly larger. Males also bear relatively larger bills, which average around compared to in females; this feature has been used to tell the sexes apart. Immature birds are distinguished by their smaller size, smaller, duller-brown bill, dark grey chin and throat, and absent or underdeveloped head plumes, often just a scattering of yellow feathers. The crest is fully developed in birds aged three to four years, a year or two before breeding age. Macaroni penguins moult once a year, a process in which they replace all of their old feathers. They
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