"SHHHHH! And move on."
She spoke, looking at him with slight annoyance.
"What you said is certainly correct however I would like to add something else."
A high pitched noise roared.
"Crows are malicious animals or at least give such a complexion. In addition many stories as well as mythologies with mainly vicious content are connected to crows. Perhaps the most intelligent of birds. Their size can vary, from being rather small, 34 centimeters or so, to reaching the height of 64. In comparison to other birds, they are seen as larger. With a distinctive black coloured plumage which is usually embellished with a violet gloss, although it can vary to a greenish or blueish colour. They have characteristic dark eyes and beak, and are seen as rather stern. Additionally, quite characteristic to these animals is their deep repertoire of melodies. Using their ability to change their vocals they can easily blend in with the surrounding birds so as to get some food. When it comes to their eating habits, they are not really that much of a picky eaters."
Her speaking was followed with her continuing the scroll down the stairs and inside the cave. It looked even pernicious there. As she came to the center of the cave, she performed few hand seals and slammed her hands onto the ground. Touching the ground a sealing formula spread upon it as well as a sort of a fume. With the fume dispersing a colossal scroll could be noticed.
"Do you have any other questions?"
She spoke as she opened the scroll. Name next to name was engraved within the scroll.
"If not I'd like you to sign here with your blood."
OOC: Not much has been shown about this summoning animal. It is mainly connected to Itachi's ability to connect the crows and genjutsu and then use it to distract and confuse his enemies. Additionally, the only so known crow is the one which Itachi entrusted Shisui's eye. Custom-wise, they can be any size as within the canon list there is a crow which reaches the height of two people and 5 meters wingspan. Honestly speaking, I would love to combine them with sound release, just due to their ability to produce vast variation of differing sounds.