In the continuous sexagenary cycle, every twelfth year corresponds to Hai, and is commonly called "the Year of the Pig" (豬年). There are five types of Pig, named after the Chinese elements. In order, they are: Metal, Water, Wood, Fire, and Earth.

According to the myths, the Pig was the last to arrive when the Jade Emperor called for the great meeting. Other sources said that Buddha called for a great meeting when he was about to leave the earth. The Pig came in last.

Legend has it that just as the emperor was about to call it a day, an oink and squeal was heard from a little Pig. The term "lazy Pig" is due here as the Pig got hungry during the race, promptly stopped for a feast then fell asleep. After the nap, the Pig continued the race and was named the 12th and last animal of the zodiac cycle.[