Okay, remember when you first summoned something and it ended up being that pathetic crow... that was because you put too little chakra into the technique. The other times you performed the technique, you put a decent amount of chakra into the technique and thus were able to summon normal sized crows. This is essentially the boss summon for crows (as it stands right now). So in order to summon it, simply channel more chakra and try to specifically call this crow. If done properly, instead of a generic summon, you'll summon this specific one.
(Kuchiyose no Jutsu: Kuroi Karasu) - Summoning Technique: Black Crow
Rank: B
Type: Supplementary
Range: Short
Chakra cost: 20
Damage points: N/A
Description: The user will summon a large black crow that stands about as tall as two people with a wingspan of about 5 meters which can be used for various tasks in combat such as generally attacking the opponent or for maneuvering around on the battlefield. The crow itself is only capable of standard physical attacks using its claws, beak and wings.
Note: can only be summoned once
This is somewhat of a basic transformation technique but it also includes your chakra so you are able to control the transformation. Instead of transforming your chakra into your image like with shadow clones, you use crows as a physical structure, and transform several of them to give your physical appearance. They're basically the same as regular clones except made of crows and can only use up to A-rank techniques. And you can only make up to 2 of them. The technique is somewhat inferior to shadow clones, but still counts as a use of clones. I'd recommend sticking with shadow clones unless for showmanship of course.
(Karasu Bunshin no Jutsu) - Crow Clone Technique
Rank: C
Type: Supplementary
Range: Short
Chakra cost: 15
Damage points: N/A
Description: A technique that produces a clone by projecting one's own chakra towards dozens of crows. These are summoned by the technique itself. Because it uses crows as a medium, it requires less chakra than the normal Shadow Clone Technique, while still being able to perform techniques (up to A-Rank). The dozens of crows come together to form the body of a clone. When the chakra projected by the user is severed, the crows disperse, though the user is still able to continue to speak through it.
Note: Can only be used by signers of the Crow contract and can only make 2 clones with each use.