Karoo

Carue, also spelled "Karoo", is Vivi's pet spot-billed duck, a fast-footed riding bird (one of the fastest modes of transportation available in Arabasta).

Personality
Carue is very loyal to Vivi as well as to her friends the Straw-Hats. He acts very unique as he does sometimes exactly what he is told, like giving his hand, or doing exactly something opposite like drinking all his water although Vivi tells him to conserve his water in the desert.

History
His role during Vivi's time with the Straw Hat Pirates is mostly that of comic relief, although he does relay valuable information to Chopper from time to time, helps Luffy and Usopp to defeat the Baroque Works agents in Little Garden and saves Vivi from Mr. 2 Bon Kurei in Arabasta. He is the center of several jokes in the Arabasta arc, at one point being used as bait for fishing by Luffy and Usopp to Vivi's anger and chagrin, and he is mistaken for an ostrich by Sanji. He is the leader of the Super Spot-Billed Duck Squad in Arabasta.

Merchandise
He featured alongside Chopper in the One Piece Desert Kingdom Mascot Keychain/Cellphone Strap collection.

Translation and Dub Issues
His name comes from the Japanese word "karugamo," which means "spot-billed duck."

In the 4Kids dub, his name is pronounced as "Kuh-roo", but in the FUNimation dub, it's pronounced "KAH-rue".

Trivia

 * In the 4th Japanese Fan Poll, Carue is ranked the 53rd most popular character in One Piece.
 * Despite his long absence from the series and his separation from ties to the Straw Hat crew, Carue has been featured on the cover page of One Piece several times along with Vivi.