A chocobo (チョコボ, chokobo) is a fictional, large, adorable, normally flightless galliforme/ratite bird capable of being ridden and is a staple of the Final Fantasy series. While ordinary chocobos are yellow, certain rare breeds are of different colors and have special abilities, such as crossing mountains or flight. An even rarer, more extreme variant is the Fat Chocobo (or Chubby Chocobo), which resembles a morbidly obese yellow or white chocobo and can humorously stock the party's items in its stomach or appear randomly when summoning a chocobo in battle. Chocobos have occasionally been sighted as lightly armored war mounts in which case they can assist their riders with beak and claw. Overall, the species is a very versatile and useful bird, which comes in handy as horses are untamed or non-existent in Final Fantasy games. The onomatopoeia for a chocobo's call is "kweh" (クエ, kue?) and is sometimes replaced with "wark" in English translations.