Took this picture just before Christmas as Philadelphia saw some pre-holiday snow, which is a bit of a rarity. The statue at front and center is Billy the Goat, which has been in the square since 1919. Here is another pic of him as the city discusses the potential to replace this staple as it's in a bit of rough shape.
Additional fact: Billy the Goat has a twin located in Camden, New Jersey just over the Delaware River in Souther New Jersey.
Here is a little more info on Billy -
http://www.visitphilly.com/music-art/philadelphia/billy/