Crows are among the most intelligent birds. They even have some degree of sentience like mammals.
A crow attacked my sister once in her back yard, and the dog sprang into action. She grabbed the crow and bit and shook it to death. After that, all the others circled around and all cawed loudly in warning. That's not just a bunch of stupid birds.
There are some species of crow that will actually remember you and lie in wait to attack you repeatedly if you don't kill it.