The crow is well known for being one of the smartest birds, perhaps one of the smartest animals in the kingdom. The Web has seen many videos demonstrating the intelligence of the crow, but here is even more proof the bird is no bird brain. A thirsty crow landed by a group of people who had a bottle of water out. The thirsty bird communicated the best he could that he needed a drink, and after a while, the people picked up on his sign language.