Passerines -

Common Loon mother with one of her two chicks (at 50 days of age). Loon chicks are ready to fly from their natal lake at about 90 days of age.

It's called "Conditioning"..........and I do not mean the kind that goes in your hair:

When I saw this Purple Finch sleeping on a twig I attached to the feeder just an hour ago (September 22, 2013), I knew I was beginning to accomplish what I seek. I want to get the birds so conditioned to seeing me in the window that I can go right up to the window and not scare them. Although this bird is within 2-3 feet of me, it is sleeping!

That is trust. You can do this at your feeder too.