So doing some research I discovered that the term wallaby applies to almost 30 species of macropods. Wallaby is an informal designation given to these marsupials that are smaller than kangaroos and wallaroos. The agile wallaby and the red necked wallaby are most closely related to kangaroos and wallaroos and are most frequently seen in the southern states of Australia.
This picture was also taken by my friend, Jennifer. She thinks it is a red necked wallaby.