Crows

At once, the distance between them closed. With incredible speed, right
and left palms came flying toward Itachi’s throat and solar plexus
simultaneously.
When Mukai’s sword hand stabbed into Itachi’s stomach, reaching for his
solar plexus, Mukai bent his index and middle fingers inside Itachi’s body.
“Hah!” Mukai spat out a breath that was a battle cry, and his sword hand
yanked out Itachi’s intestines.
Instantly, the Itachi standing there with his guts ripped out transformed
into an overwhelming number of crows, and danced upward. Rather than try
to avoid the beaks attacking him, Mukai endured it with an elegant turn of the
head, as though nothing were happening.

Itachi Shinden Book of Dark Night Chapter 4 Part 2