The video is not correctly exposed, a bit dark, for my taste. But I need to figure out how to make the mouth move like this because I want to make one. It appears it is one photo with the mouth morphed to the music because the feet and body don't move at all. Watch carefully and notice the eyes blink a few times and the neck turn just a tiny bit. These subtle movements make this singing guinea pig appear natural.
I can't get enough of this video. When I get really bored, I will attempt to create a video of a singing animal.