The Chinese zodiac animal traditionally associated with the earthly branch Wu is the Horse.
Wu is the seventh of the 12 earthly branches, and each branch corresponds to one animal in the traditional zodiac. The branch-animal pairing runs in the same sequence as the familiar signs: Zi-Rat, Chou-Ox, Yin-Tiger, Mao-Rabbit, Chen-Dragon, Si-Snake, and Wu-Horse.
Wu is also connected with the traditional time period from about 11 a.m. to 1 p.m. In Chinese calendrical notation, earthly branches can describe more than years: they also appear in systems for months, days, and hours.
The same branch may be represented in different Romanizations, including Wu and Wŭ in specialized transliteration systems. The Horse pairing itself remains consistent in standard Chinese zodiac references.