Our crazy twins

Now that we have two very mobile babies in the house we never know where we are going to find them next. Luke has a fascination with Dexter's food and water dish and crawls to it whenever he is hanging out upstairs. The other day he explored his way down the hall and we found him playing in his room. Today he decided that underneath the excersaucer was a fun place to play. Abby tries to stand up on everything...including Dexter. We found a gnawed area of our fireplace hearth from where our little beaver was teething. They are keeping us on our toes!
Look...we can both stand and play with our toys!
Abby hanging out under the coffee table.
Who put this thing up?