12 Animals were chose deliberately for the Chinese Calendar but the legend, the myth, the story of how they were chosen is a curious one. Thanks, Jade Emperor for organizing the Great Race
Chinese Calendar has 12 Animals assigned to a Ying and Yang sequence. Half of them are close to the daily life of ancient Chinese people and other half are loved by the Chinese. Be aware of Tai Sui (The God of Age) who will probably bring you some bad luck when the year of your animal comes which is every 12 years.