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Each village has used a different seal when creating their jinchūriki. For example, Konoha used the Eight Trigrams Sealing Style, and Kumogakure used the Iron Armour Seal. Akatsuki, an organisation whose role in the series is to capture the jinchūriki, uses the Illusionary Dragon Nine Consuming Seals to extract and seal the tailed beasts within the Demonic Statue of the Outer Path for future use. They have, as of the Fourth Shinobi World War, captured seven of the nine beasts.
If the tailed beast is removed from its jinchūriki's body, the jinchūriki will die. Similarly, if the jinchūriki dies with the tailed beast still sealed within them, the beast will die too. Because of this, the tailed beasts tend to be very protective of their jinchūriki, and will take any action whenever their lives are in danger. However, this was not always the case; before the Nine-Tails was sealed into Naruto, it was said that it could survive its jinchūriki's death, with the only consequence being that it would take time for it to be revived.[6] Also, rare exceptions of a jinchūriki surviving an extraction may occur, if the said host has high enough stamina.[7]
The seal that keeps a tailed beast within its female jinchūriki is at its weakest when she is in childbirth, due to the nurturing of the child in the womb using the power of the seal, weakening the seal in direct proportion. As such, a ninja is required to keep the seal intact during childbirth, and restore the seal back to full power afterwards. A full-term pregnancy for a female jinchūriki is about ten months, presumably because the body has to nurture both the child and the seal simultaneously; as a result, the child develops more slowly