it was one tail, not two. and i think kyuubi can run out. iono, discussing naruto this hardcorely takes the fun outta it.
Its been stated that the Kyuubi has near infinite chakra, but I think why Naruto is so worn out after using Kyuubi Chakra is that his body can't take any more of the more of the Demon's power. Remember Jiraiya stated that the more Naruto uses the Kyuubi's chakra, the more it will damage his body...
The power of those demon's are immeasurable, and all in all, its the Jinchuuriki's bodies that don't allow them to fully utilize the power of their respective demons.
Interesting thought. There are 9 Bijuu's in the world and at least of two of them have been captured. If I remember from Japanese Mythology correctly, Yamata-no-Orochi, is a giant snake demon with eight heads and eight tails. That could mean that its the 8th Bijuu. Could it be possible that Orocimaru, who is associated with Snake's have the power of a Bijuu? After all, he was in Akatsuki.




















