Bazu's grudge against humanity is actually kinda appropriate considering how vengeful crows are.
...they are? :|
They recognize people and recognize patterns in treatment by them to the point where they can form violent grudges where they harass known enemies and even teach their children and other crows to harass them. They also recognize friendly treatment and people have even experienced instances of crows they've been friendly to giving them gifts.
That's not being "vengeful", that's learning from experience and having a good memory. Most halfway smart animals can do something similar which is why assorted scarecrow-type devices work very poorly on many birds (gulls being a prominent urban example). Also culture of sorts in the form of passing on knowledge to offspring.
Their smaller cousins the jackdaws do something similar; they exchange tips on foraging prospects when they gather in their characteristic noisy nighttime roosts.