Colin is doing the type of things little boys do: climbing and jumping off things, collecting/throwing rocks, getting bumps and scrapes. If anyone is training for a marathon, take Colin along. He just runs, a lot, for no reason. He'll do circles, he'll run back and forth, he'll run around anything. Apparently daddy had a distinct hunch when he ran. It's hard to say how similar it looks, but Colin will hunch over a bit and move those arms when he is in full running mode. Maybe that's some genetic thing...
Some other highlights: counting to ten, able to recite a majority of books he gets read a lot, using the potty right after baths/showers. There may be more, but that is all that is coming to mind right now.
We discovered Colin likes to dance while he eats, sometimes. He's been doing this for a while, we've just been lazy about getting it recorded. He recently threw in some body movements too. It's not a very long dance but it shows the main moves.