July 28: World Hepatitis Day; Independence Day in Peru (1821) Papilio machaon is a butterfly of the family Papilionidae and the type species of the genus Papilio. Despite its common name Old World swallowtail, this species is not restricted to the Old World, as populations can be found in North America. The butterfly has a strong and fast flight, but frequently pauses to hover over flowering herbs and sip nectar. It frequents alpine meadows and hillsides, and males are fond of congregating near summits to compete for passing females. The species feeds mostly on plants of family Umbelliferae. Photograph: Werner Pichler Wikipedia is hosted by the Wikimedia Foundation, a non-profit organization that also hosts a range of other projects: This Wikipedia is written in English. Started in 2001 (2001), it currently contains 4,929,647 articles. Many other Wikipedias are available; some of the largest are listed below.