Clean Monday
Clean Monday is a public holiday in Greece and Cyprus, where it is celebrated with outdoor excursions, the consumption of shellfish and other fasting food, a special kind of azyme bread, baked only on that day, named "lagana" () and the widespread custom of flying kites. Eating meat, eggs and dairy products is traditionally forbidden to Orthodox Christians throughout Lent, with fish being eaten only on major feast days, but shellfish is permitted in European denominations. This has created the tradition of eating elaborate dishes based on seafood (shellfish, molluscs, fish roe etc.). Traditionally, it is considered to mark the beginning of the spring season, a notion which was used symbolically in Ivan Bunin's critically acclaimed story, "Pure Monday".
Judaism
Many of the laws apply to animal-based foods. For example, in order to be considered kosher, mammals must have split hooves and chew their cud. The pig is arguably the most well-known example of a non-kosher animal. Although it has split hooves, it does not chew its cud. For seafood to be kosher, the animal must have fins and scales. Certain types of seafood, such as shellfish, crustaceans, and eels, are therefore considered non-kosher. Concerning birds, a list of non-kosher species is given in the Torah. The exact translations of many of the species have not survived, and some non-kosher birds' identities are no longer certain. However, traditions exist about the "kashrut" status of a few birds. For example, both chickens and turkeys are permitted in most communities. Other types of animals, such as amphibians, reptiles, and most insects, are prohibited altogether.