 A pigeon is a grammatically simplified means of communication that develops when speakers from different language communities come in contact and must interact. The initial development of a pigeon usually requires three conditions. Regular contact between different language communities, a need to communicate between them for example in situations such as trade, and a multilingual setting where different languages are spoken. A pigeon serves as a solution to a language barrier and involves the development of a new language that is built from the lexicon of a target language. Pigeons are often defined as reduced languages that are native to no one but rather are used by people who do not share a common language. There are many examples of pigeon languages that can be seen around the world. For instance Tok Pisin, an English Creole language that developed from a trade pigeon in Papua New Guinea. Additionally pigeon Delaware was a pigeon language spoken between speakers of Unami Delaware and Dutch settlers on the Delaware River in the 1620s. Lastly, international sign language is a contact variety of sign language that is often used in international meetings of the deaf.