Fun fact, there is little info on crows (as far as species of interest go) because they're so good at evading human tactics for collection and observation. I had a friend who studied them in grad school. Not only do they describe humans to each other (so crows you've never seen before will avoid you), they also learn the precise distance of net cannons (for trapping and tagging) after 1 encounter and then stand at that distance the entire time (making naive researchers think maybe they can juuuust caych em). So basically you need to befriend them (a common strategy), or find a murder that's never seen you before (researchers wear presidents masks to throw them off, but then they remember and describe the cars). In this case, you have one chance to collect enough in the group to get good data. Whatever crow you catch once, you probably will never catch again, ruling out biosensing devices (like they use with other birds and turtles n junk).
The latest big finding about crows is that they have a grasp of knowledge breadth, meaning they "know what they know" meaning they are conscious (self aware), have subjective experiences and can reflect on their knowledge. (Source) This also implies they have an understanding of the unknown.