It is a flip card: you mark the center of your card-front vertically, trace a shape, centered on the fold, then cut out only half of the shape, and fold the remainder of card-front back, leaving the shape free to flip back and forth, as you open the card.
The owl stamp and sentiment are from Stephanie Barnard's Stamps of Life "owls2love" set http://www.stephaniebarnardstamps.com/products.htm., with the birthday greeting from the "happy2becircles" set. The tree trunk is a Sizzix die, which I cut in half and used on the inside and outside of the card.
The card was for my 4-year-old niece, Rachel, who decided she didn't want a Disney princess-theme for her party this year, but an autumn one. Her cake, made by my talented sister and brother-in-law, was covered in edible leaves, made by "painting" real leaves with tinted white-chocolate. It was gorgeous and delicious!