Nikkor 17-55 AF-S f2.8. Audio comes through a RØDE Videomic Pro. I also used a 7" monitor on top of the camera, to get sharper focus.
It was quite fun shooting in nature like this. It takes a lot of patience, and you have to be quite careful. I almost slipped a few times, not a good thing to do lugging a 10 kilo tripod plus camera on your back. But the results were quite good, and this is actually the first video that got me any likes on Vimeo.