A lot of average stuff. Waking, breathing, eating, showering, hair-brushing, walking, sitting, standing, leaning, clothes-wearing, reading, writing, talking, listening, thinking, forgetting, pissing, shitting, door-opening, door-closing, watching, contemplating, counting, adding, dividing, multiplying, equalising, minusing, humming, lip-syncing, sighing, avoiding, typing, note-taking, buying, burping, microwaving, washing, drying, sweating, lying, drinking, sleeping. That is not in order, by the way. Most of my days don't begin with me waking up at all, that's how most of my nights begin.
I don't have one. Terrible answer, I know, but it's true. I don't have a favourite bird because birds have never interested me and I have never bothered making them an active interest because they're uninteresting to me. So to recap: I have no interest in birds because I find birds uninteresting.
I am going to say the egg. I don't know anything about genetics but sometimes two people can have a really ugly baby and sometimes you think to yourself, "gee, is that a different species of human or is that their kid?" I can assume it's easier for chickens to have evolved as the ugly offspring of two other birds rather than have developed a completely different reproductive system overnight.