They also like to annoy other animals. I have seen it now a few times that a crow or a group of
crows would approach a dog from behind and nip their tail or butt. When the dog turns around the crow will jump back a little and pretend it has nothing to do with this. When the dog looks away they will do it again. I have seen similar behavior with swans. When my dog chases they get out of the way but only the minimum needed.
They also do this to cats, which is much more dangerous. There's a video with a cat catching a bird (not a crow) that did this: https://youtube.com/watch?v=nfIQifAcm0g
In that case, yes. It was just to illustrate that cats are eerily effective at catching birds mid-flight.
But I have seen a cat trotting along a wire fence with a concrete base. On that base, which was about the cat's height there was a hooded crow happily scuttering behind the cat and grabbing at its tail from time to time.
The cat mostly ignored it but it was apparent that it judges the chances of catching the pesky bird.
To me, the "will they mess with other animals for giggles" and "do they recognize other intelligent animals" are the barrier for entry into the "intelligence" consideration.
Dolphins (including orca) do, primates do, the article says crows do. Cats and dogs do too.
Very smart but obnoxious in a way.
Just found this on YouTube: https://youtu.be/Y0xwX5iOFok