Yeah, there's even a lot of evidence that they're capable of future planning which is something that was thought to only be present in great apes and humans. They did an experiment on Hawaiian Crows (which are extinct in the wild) and they were able to recognize that they would need a certain length stick to get a food reward out of a container, and they then went out and modified sticks to be just the right length. Granted in this case I think there may have been some unnatural selection. Hawaiian Crows went extinct in the wild after heavy urbanization of the islands, and the breeding program grabbed up survivors well after the population took a massive dive. I'd suspect that if you made a "crow IQ test" and rated normal at 100 like a human test, that it would be found that the subjects in captivity were at least two standard deviations above the mean. I think what happened was basically the smart ones survived the longest and those were the ones that ultimately ended up in the breeding program. Since intelligence is largely dictated by genetics and you only had the most intellectual individuals reproducing, you basically had a reverse Idiocracy effect.