Mr. Homer the hummer seems to adore me. His love affair with me (and my nectar) may be called "imprinting"? I'm not sure. Here's the definition: im·print·ing (mprntng) n. A rapid learning process by which a newborn or very young animal establishes an attraction to another animal of its own kind or to a substitute or an object identified as the parent.
Okay, I'll call it "a behavior pattern of recognition." He comes when I call, he rarely leaves the yard and he won't let any other hummingbirds stay for very long. He's chased away the Anna's, Black-chinned, Broad-billed and Rufous, with one exception...the ladies. He lets the girls come for juice.