What animals is this fence behind of, giraffes or elephants?
The fence is behind giraffes.
    src        edge_attr  dst
0     0           behind    9
1     1  to the right of   10
2     1  to the right of   15
3     1               on   11
4     2               of   11
5     2  to the right of   15
6     2  to the right of   10
7     3  to the right of    4
8     3  to the right of    9
9     4       looking at    4
10    4  to the right of    6
11    4  to the right of   15
12    4  to the right of   10
13    4   to the left of    3
14    4  to the right of   14
15    5               of   11
16    6   to the left of    4
17    7  to the right of   11
18    8  to the right of   10
19    8  to the right of   15
20    9      in front of    0
21    9      in front of   16
22    9   to the left of    3
23   10   to the left of    2
24   10   to the left of    4
25   10   to the left of    1
26   10   to the left of   13
27   10   to the left of    8
28   11   to the left of   12
29   11   to the left of    7
30   12  to the right of   11
31   13  to the right of   15
32   13  to the right of   10
33   14   to the left of    4
34   15   to the left of    1
35   15   to the left of    4
36   15   to the left of    8
37   15   to the left of   13
38   15   to the left of    2
39   16           behind    9