What kind of animal are the trees behind of?
The trees are behind the giraffes.
    src        edge_attr  dst
0     0  to the right of    8
1     1  to the right of    8
2     1               of   11
3     2   to the left of    8
4     3   to the left of   11
5     3           behind   14
6     3  to the right of    5
7     3  to the right of    8
8     4  to the right of   12
9     4   to the left of   11
10    4               of   11
11    5   to the left of   15
12    5   to the left of   11
13    5               of   11
14    5  to the right of    7
15    5   to the left of    3
16    6               of   11
17    6  to the right of    8
18    7           behind    8
19    7   to the left of    5
20    8      in front of    7
21    8   to the left of   11
22    8  to the right of   14
23    8   to the left of   15
24    8   to the left of    0
25    8  to the right of    2
26    8   to the left of    1
27    8   to the left of    6
28    8   to the left of    3
29   10   to the left of   15
30   11  to the right of    3
31   11  to the right of    4
32   11  to the right of   12
33   11  to the right of    8
34   11  to the right of    5
35   11  to the right of   15
36   11               in   13
37   12               of   11
38   12   to the left of   11
39   12   to the left of    4
40   14   to the left of    8
41   14      in front of    3
42   15  to the right of    8
43   15  to the right of    5
44   15  to the right of   10
45   15   to the left of   11