I'm just amazed at Ezra crawling. It's like a miracle every time he does it. It takes so much effort! Did you see the video clip? Well, it's much more suspenseful in person-- he makes these frustrated, distressed little noises, and his concentration is so intense; it takes every ounce of his power and coordination!
It's funny, I don't remember the first time Gibbie crawled on all fours. He was a slider. He slid for months on his belly, and boy, was he fast! He would drool and slide over his drool track, mopping up after himself; somewhere between a slug and a swiffer. He gradually transitioned into this more traditional crawl.
Ezra's been moving for a while, spinning on his belly, sit-to-lay extensions, inching forward or back by extreme reaching, clambering up on or over things; but he didn't really slide like Gibbie at all. I thought sliding was the natural precursor to crawling, but they each have to blaze their own trail.