The Chocobo is the yellow bird
The Chocobo is a creature and mainstay of the Final Fantasy series. It is a large, flight-less, yellow, chicken-like bird that people ride like a horse. They are one of the reoccurring icons of the series, along with Moogles, Cactuars and more. Chocobos have even starred in spin-off games like Chocobo Racing.
baby Chocobo from FFXI