Crows, or other birds from the corvid family, are absurdly smart. They can recognize and distinguish human faces. You should befriend them, if possible. They're known to bring shiny shit to people they like. Usually, it's just garbage- nails, little bits of metal and such. But maybe, if you get really lucky, they'll find jewelry and bring it to you. I work near a landfill facility- crows love following the dump trucks, easy source of food. I fed them some scraps a few times, and I swear they come and visit me when I'm at work. They'll abandon a pile of garbage to come flock to the tree I'm standing under- and they don't even shit on me! I call them my crow-bros. Be cool to crows, because they can be vindictive as hell, and might surprise you with how creatively they can ruin your day...