We have a family of Crows who comes every morning, calls my wife, who gives them some treats and then go about their day. Sometimes they return at noon for lunch. We started leaving them puzzles to get to their food but they solved these pretty quickly. We now need to up our game. Originally it was just a couple. At some point only one came, which meant the other was watching their egg/offspring. Sure enough some time later kiddo joined them. Amazing bird.