What animals is the fence behind of?
The fence is behind the giraffes.
    src        edge_attr  dst
0     0           behind    2
1     1  to the right of    3
2     2  to the right of    3
3     2      in front of    7
4     2      in front of    0
5     3   to the left of    1
6     3   to the left of    5
7     3   to the left of    2
8     5  to the right of    3
9     7      in front of    8
10    7           behind    2
11    8           behind    7