If you only want to see the ears move, skip to 5:19.
Information about the necomimi fursuit head and demonstration of putting it on and showing how the ears move.
More info on the pros and cons of a necomimi headset in a fursuit head: http://cityfursuits.tumblr.com/post/111012511297
More info on my fursuits: http://www.furaffinity.net/journal/6545504/
Sharpe19 (person who made this head)'s site: http://sharpecostumes.com