Bat

Ninja-Bats, Seichū, are Bats that are used by a Bat-user Ninja, and their relationship seems to be similar to the Kikaichū's relationship with the Aburame clan, and the Ninken's releationship with the Inuzuka clan. So-far, the only Bat-user was a ninja called Rinji, who has only been seen in the anime-only 'Three-Tails Arrival' filler arc. It is unknown if the practice of a Bat-user is a Hiden Jutsu of Rinji's clan, or if it the results of Orochimaru's numerous human experiments.

The Bat-user ninja, Rinji, has the ability to use ultrasonic waves to use the Bat Controlling: Ultrasonic Waves technique so that he could communicate with bats, and likewise they can communicate with him: The Bat-user, Rinji, has the special ability to produce ultrasonic waves and understand them. This way he can talk with bats, who use ultrasonic waves for communication. He is able to give them orders; like to search the area around him. He can use these bats for his attack, the Bat Controlling: Ultrasonic Mind Waves technique.

Once the Sound Ninja Rinji controls his bats, he can commands them to produce high frequency ultrasonic waves that affect the mind of the opponent. These bats (along with Shino's evolving bug strategy) have been the only effective counters to the Crystal Style. The ultrasound waves move at a frequency that allowed the crystal to breakdown at a molecular level. Allowed dispersion of crystal particles back into the air.