Scientist have known, and most people know, that Chimps and Dolphins, which are Mammals, are amongst the most intelligent Species besides Humans - and yes, Humans are Mammals too! However, experiments have shown that Crow intelligence is right up there with the intelligence of Chimps and Dolphins. Young Crows have even been observed socializing and playing with young Wolves, and Wolves will allow Crows to feast with them after a kill.
Crows can use and make tools, solve complex puzzles in Experiments to obtain food, talk like Parrots, and exhibit many other intelligent behaviors. And so much for calling someone stupid a Bird Brain!
Check out this video, entitled "Why Crows Are as Smart as 7 Year Old Humans:"
Michael Piziak, BS, MA
Addendum: Crows will also remember a specific Human face. Here's another interesting video: