The twin pandas of Vienna Zoo Schonbrunn celebrated their first birthday on August 1 with packages filled with sweet potatoes, carrots and other vegetable treats.The twins, named Fu Feng and Fu Ban, can be seen in this video frolicking with their presents.The pandas became known internationally after naming footage of them from last November went viral. A press release from the zoo states that over the course of the last year, the two have grown from about 100 grams (.22 pounds) to 18 and 22 kilograms (40 and 29 pounds). Credit: Vienna Zoo Schonbrunn via Storyful