Avian Holiday 3D Pop-Up Advent Calendar Avian Holiday 3D Pop-Up Advent Calendar Size: 12.30" (w) x 13.80" (h) x 0.20" (d) Count down the days until Christmas with this wonderful Avian Holiday pop-up advent calendar. Includes 1 Pop-up Tree, 24 bird ornaments and 1 golden star Interactie Pop-up Advent calendar