Guess who's crawling now?

So the day we returned from our trip to Boston, Nate began crawling. His first attempts were pretty unstable and slow, but now, about 6 weeks later, he is a maniac. Maniac! We took him to Stinson Beach in Marin and he completely went nuts, crawling around and laughing and putting his hands up in the air in a weird sort of celebratory move. At home, he likes to chase balls around and around in a loop through the kitchen, hallway and livingroom, or he rolls them under the couch and then tries to figure out how to get underneath to retrieve them. It's a lot of fun but you can't take your eyes off him for a second!