This is insane. But I'm impressed most of all by the quality of motion. I've quite simply never seen convincing computer-generated motion before. Just look at the way the wooly mammoths connect with the ground, and their lumbering mass feels real.

Motion-capture works fine because that's real motion, but every time people try to animate humans and animals, even in big-budget CGI movies, it's always ultimately obviously fake. There are so many subtle things that happen in terms of acceleration and deceleration of all of the different parts of an organism, that no animator ever gets it 100% right. No animation algorithm gets it to a point where it's believable, just where it's "less bad".

But these videos seem to be getting it entirely believable for both people and animals. Which is wild.

And then of course, not to mention that these are entirely believable 3D spaces, with seemingly full object permanence. As opposed to other efforts I've seen which are basically briefly animating a 2D scene to make it seem vaguely 3D.