That was beautiful! I really am impressed at how strong you made these emotions. The animation was quite good. I was in no way expecting this. I thought it would just be a video about nature. I guess that's what documentaries are for.
The music was great. I heard that before, but had no idea it was from Bjork! Then again, you did use various audio. I really did feel bad for that baby bird. It looks like it will still be hard to take care of it.