We made this card a few months ago in my Stepped Up Cards class. I saw it on another blog and wanted to try something similar.
I cut a 3" circle in the card front, and cut an insert for the inside of the card. I cut a thin slit about 3" long in the middle of the insert to hold the peekaboo piece in place. The peekaboo card stock is just under 3" wide to fit through the circle, and cut at one end with a label framelit. It is scored about 3/4" from the other end to secure it to the inside of the card. I stamped the birds and cages on the card stock strip, and added the punched and die cut leaves to keep it from going all the way through the circle when you open the card.