I saw this on google:
The tailed beasts (尾獣, bijū) are giant demons that serve to drive the plot of the Naruto series, refered as "Chakra Monsters" because they are actually living "ultimate chakra", far beyond a normal human's and given physical form. Because of their power, the tailed beasts served as weapons and tools used in Ninja Wars until it ended and several of the tailed beasts were distributed by the First Hokage amongst the five ninja nations as a peace treaty, in order to stabilize the balance of power between nations. Each revealed tailed beast is around the size of Gamabunta, who is over 100 meters tall. They are differentiated by the number of tails they have, with each possessing an amount from one to nine. However, this immense strength is tempered due to their bestial nature, which restricts some of them from being smart enough to use it effectively as seen with the three-tailed beast. Beasts sealed within another person are able to benefit from the knowledge of their hosts, giving them the ability to speak and better utilize their powers.
Akatsuki is currently collecting the tailed beasts, capturing the hosts and take them to a secret location where a three day long jutsu is performed to draw out the tailed beast from the host. They possess seven of the nine tailed beasts: Shukaku, the one-tailed tanuki (former host was Gaara); the two-tailed demon cat (former host was Yugito Nii, a ninja from Cloud Village); the turtle-like three-tailed beast; the four-tailed beast (extracted from an unknown elderly man); the five-tailed beast; the six-tailed beast; and the seven-tailed beast. Only the eight-tailed beast (within an unknown man of the Cloud Village; it appears to be an octopus-like creature) and the Nine-Tailed Fox (within Naruto's body) are yet to be captured. Pein claims that when all nine beasts are sealed, he will be able to create a jutsu powerful enough to instantly wipe out a country
Somehow, we escaped. Horray! I will post more info.
~Shukaku
