What animal is the fence behind of?
The fence is behind the giraffe.
    src        edge_attr  dst
0     1   to the left of    3
1     1  to the right of   18
2     3  to the right of    9
3     3   to the left of    4
4     3  to the right of   19
5     3  to the right of   18
6     3  to the right of    1
7     4  to the right of    3
8     5           behind    9
9     5      in front of    6
10    6           behind    5
11    9      standing in   13
12    9      in front of    5
13    9           inside    0
14    9               in    0
15    9   to the left of    3
16    9  to the right of   18
17   11            below   12
18   17               on   11
19   18   to the left of    3
20   18   to the left of    9
21   18   to the left of   19
22   18   to the left of    1
23   19  on the front of    9
24   19   to the left of    3
25   19  to the right of   18