My mom feeds the crows hoping for a ring :) Birds are super smart.

When I lived in Reno, NV, I used to walk around a lake twice a day. I took bird seed and duck feed with me and fed the swan and some of the geese (and pigeons if the geese weren't around). The swan started swimming the lake next to me as I walked. Anytime a stranger would get to close to me he'd start flapping and kinda standing up in the water scaring them off. It was awesome. I loved my swan friend.