Many of the smallest wild birds are fearless and happy little bustards.

If you feed or water (even more important and appreciated than food in winter) them, they become your friends. They follow me around in my backyard. But my backyard can be dangerous for them, since a local hawk visits from time to time. I put nice juicy fresh squirrel out, but he only wants birds (usually fatter mourning doves).
I have a pair of finches spending winter nights up inside my backdoor awning. I tore out several nests this summer, but laid off them this winter (esp after they learned NOT to build a nest). I get a few droppings around the edge of my basement walkout; not such a big deal.
I'm no St Francis, but I enjoy my tiny flying dinosaurs.
One of my bird stories involves a big old crow who staked out an SUV luggage rack in a pull-off off Skyline Drive. I rode in to take a break, walked past him and he hollered at me. I talked to him and went closer and he got all tactical on me until I backed up two steps. The owners of the SUV came back from a trail walk, and the crow did not want to let them have their car back. Everyone was being gentle with the old fellow. The lady put some food down on the ground and walked away, but the crow saw through the ploy and laughed at her. Which made us all laugh too. He seemed to thoroughly enjoy the human contact and being center stage.
You know what the smartest bird on the planet is, right?