Their intelligence was clear to me growing up around them, without knowing anything about crows specifically. They clearly have intelligent interactions with each other and the environment, and have a "theory of mind" of people approaching them/interacting with them. They could also figure out how to open/untie garbage bags, gang up to bully other birds and take their food, etc. In the mornings, right outside our house, they would congregate on a tall pine tree and it really looked like they were having a daily standup - one of them yells loudly, others listen silently, then start making noise together :)