Are there either any zebras or giraffes?
Yes, there is a giraffe.
    src        edge_attr  dst
0     0   to the left of   13
1     0   to the left of   11
2     1   to the left of   13
3     1   to the left of    6
4     2   to the left of   11
5     3   to the left of   12
6     3   to the left of   15
7     3   to the left of   11
8     4   to the left of    5
9     5  to the right of    4
10    6  to the right of   19
11    6  to the right of    1
12    7   to the left of   11
13    7   to the left of   20
14    9      standing in    8
15   10   to the left of   12
16   10   to the left of   11
17   10   to the left of   16
18   11  to the right of   12
19   11  to the right of   18
20   11  to the right of    7
21   11  to the right of    3
22   11  to the right of   15
23   11  to the right of    2
24   11  to the right of   16
25   11  to the right of   10
26   11  to the right of    0
27   12  to the right of   16
28   12  to the right of   10
29   12   to the left of   11
30   12  to the right of    3
31   13  to the right of    1
32   13  to the right of    0
33   13  to the right of   19
34   14   to the left of   20
35   15   to the left of   11
36   15  to the right of    3
37   16  to the right of   10
38   16   to the left of   12
39   16   to the left of   11
40   18   to the left of   11
41   19   to the left of    6
42   19   to the left of   13
43   20  to the right of   14
44   20  to the right of    7