Yes, I have seen videos of those experiments with crows. They are definitely smart creatures. I observe them in my backyard, especially their "family" relationships and little tiffs between them when it comes to eating. I have been feeding them over last two or three years, but this year have not done. I found they sometimes perched on the back of the chair I sit on in the backyard and were leaving their droppings behind on the back of my chair. So I stopped feeding them. I do find them fascinating birds though. They sometimes used to sit in the backyard, and just look at me for long periods. They would twist their head sideways and just look at me for the longest time.