Shukaku (守鶴, Shukaku), more commonly known as the One-Tail (一尾, Ichibi), is one of the nine tailed beasts. It was last sealed within Gaara of Sunagakure, after being sealed in two other jinchūriki before him.
Sealings[]
It was first sealed into a Sumo civilian and novice monk named Bunpunku. Later Gaara, Obito, and finally Naruto Uzumaki. It was used by the third Kazekage as a war weapon, during one of the flashbacks in Naruto Shippuden, it is seen Gaara's uncle was sent to murder him and his reasoning to accepting was not because he was ordered by the Kazekage, it was because he hated Gaara.