Satori

is a demonic, bird-like creature that appears in Naruto 5: Blood Prison.

Appearance
The beast is large, similar in size to Gamabunta and the Eight-Tails, with large wings. It is headless, with four red eyes and bones potruding from the mouth on its chest and is covered in black feathers.

Abilities
It can shoot its feathers and giant spheres at high speeds and appears to be very strong and a fast flyer. Due to the Box of Ultimate Bliss, its body can detect fear and blood lust, which causes it to instinctively dodge essentially all attacks from opponents who have any fear in them. This ability allowed it to dodge all of the attacks from the entirety of the Konoha 11 and Naruto Uzumaki, even while he was in Sage Mode.

Trivia

 * It was thought that Satori had the ability to read the minds and hearts of his opponents in order to evade all of their attacks, but in reality its body detected certain emotions like fear, causing it to instinctively dodge their attacks.
 * Satori comes from a Japanese Buddhist term for enlightenment, meaning "understanding" and is based upon the yōkai of Japanese folklore.