The 4 Tailed Beast(Gorilla)

The 4 Tails is a Gorilla named SonGoku he was made when the sage of 6 paths split the 10 tails into 9 separate tailed beasts.

The 1 Tailed Shukaku

The 2 Tailed Matatabi

The 3 Tailed Isobu

The 4 Tailed SonGoku

The 5 Tailed Kokou

The 6 Tailed Saiken

The 7 Tailed Chomei

The 8 Tailed Gyuki

The 9 Tailed Kurama

SonGoku hated humans but he was sealed within Taiso the 1st Jinchuriki of SonGoku but Taiso was killed in The 2nd Shinobi war.

Then after 29 years The 4 Tails was sealed into a shinobi named Roshi when Roshi was 32 years old. Roshi was killed when SonGoku ws extracted and tooken captive from Roshi in order to bring back the 10 tails, That is why The Akatsuki kidnapped The Jinchuriki.

SonGoku was set free by Killer Bee the jinchuriki of The 8 Tails and Naruto The Jinchuriki of the 9 Tails and Gaara The 5th Kazekage also the former jinchuriki of the 1 Tailed Beast Shukaku.

SonGoku met the nephew of Roshi and The 4 Tails wanted to see what was Yolian 's personality so SonGoku had Yolian seal him into Yolian.