This video demonstrates so many things that are happening with Marlo these days.
She is very mobile (and quick), she's expressing what she wants (and testing out what a cry will get her) and her pincer grasp is developing nicely (I think catching a small insect should be a new milestone).
I think it's pretty funny that if I tell her "yuck, don't put it in your mouth" she just turns so that she thinks I can't see her and gives it another try.
Disclaimer: Normally if have to take something away from Marlo and she cries I don't give it right back to her, I'm not that much of a push over, but I was conducting a little research in infant Marlo behavior.