Bowing deer in Nara Park, Japan. I'm feeding them a cracker called shikasenbei. A small stack of these crackers can be found for sale around the park for 150 yen.
In Yosemite a deer once killed a child who was feeding him then stopped. The deer rose up and hoofed him. My interactions between wild animals and humans end badly. Wild animals should be observed from a distance, better for all concerned.