It's amazing how far this child can travel. His technique involves flipping over onto his back, arching his back up off the floor and leaning his head back, then shoving off with his feet. Essentially, he ends up scooting along blindly backwards with only his head and heels contacting the ground. It looks like a lot of work to me. Lately, he's also been adding some serious grunts to his movements. here's a short video of him scooting along:
He's also often flipping back over to his stomach, I guess to check and see if he has miraculously learned how to crawl. When he realizes he's not going anywhere, he'll flip back over onto his back and continue on. In this next short video, he's trying to get to the cat, even though she's up on the kitchen table. He's always trying to find his way to the cat. He's practically obsessed with her.
And when scooting becomes too much work, he can always hop on the Tonka and cruise in style for awhile:
One way or another, this kid is going to figure out how to get around.