What animal is the wall behind of?
The wall is behind the zebra.
    src        edge_attr  dst
0     0   to the left of    1
1     0  to the right of   17
2     1  to the right of   17
3     1  to the right of    0
4     2  to the right of    5
5     3  to the right of   13
6     5   to the left of    2
7    11  to the right of   13
8    11  standing behind   14
9    13   to the left of    3
10   13   to the left of   11
11   13   to the left of   18
12   13   to the left of   20
13   13   to the left of   21
14   13  standing behind   14
15   14           behind   19
16   16  to the right of   20
17   16  to the right of   17
18   17   to the left of    0
19   17   to the left of   16
20   17   to the left of    1
21   18  to the right of   13
22   19      in front of   14
23   20   to the left of   16
24   20  to the right of   13
25   21  to the right of   13
26   22  standing behind   14