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 and cheese while "shells and cheese" is sometimes used when it is made with Conchiglie. While Cheddar cheese is most commonly used for macaroni and cheese, other cheeses may also be used—usually sharp in flavor—and two or more cheeses can be combined. Popular recipes include using Gruyere, Gouda, Havarti, and Parmesan cheese. Macaroni and cheese can be made by simply layering slices of cheese and pasta (often with butter and/or evaporated milk) then baking in a casserole, rather than preparing as a cheese sauce. Also, some like to include a crunchy topping to their baked macaroni and cheese by topping it off