They are all black or black with little white or grey plumage. They are stout with strong bills and legs, Crows are pretty big when you compare one to your average bird; they are also smart, included in the group of smartest animals. I've seen enough of them due to Itachi and i've very live images of them as I see quite a few in rl.There sadly aren't that many crow techniques to ask more on the topic and this isn't exactly a "what customs do you want to make" training so... that'll suffice.
Let us do some image training so that you know what you are going to summon to make it easier to call forth a crow. Describe the general features of the crow. Size in relation to other animals, colors, etc., the basics. Essentially, what does a crow look like to you in your mind.
*Repeating the same process, this time I ensure that the amount of summons increases by deployed a measured amount of chakra. The flock is summon as it swarms around the tree nearby. Coveing it over with their black wings all over. Once the demostration subdues, the flock puffs back onto where they come from, leaving behind pure smoke.*You fail in your attempt to summon a massive crow but summon a decent sized crow. Now summon the same exact size crow, except just summon many of them at the same time. No other difference than that. The crows do nothing more than annoy your opponent. Giving you a small opening. Of course, you opponent could just spam a large technique and get rid of them at once. But nonetheless, go ahead and summon a bunch of crows.
(Kuchiyose no Jutsu: Satsujin Konmei no Karasu) - Summoning Technique: Murder of Crows Confusion
Rank: C
Type: Supplementary
Range: Short-Long
Chakra Cost: 15
Damage Points: N/A
Description: Summoning a massive swarm of crows, they will fly around the target, causing confusion with their dark forms and quick movement. With the target distracted by the crows, the ninja can strike more easily. Also the mass of crows can obscure any retreating ninja. When no longer needed, the murder of crows will simply puff away in smoke.