Do the animals have the same type?
No, there are both giraffes and zebras.
    src        edge_attr  dst
0     0   to the left of    4
1     0  to the right of    3
2     0   to the left of    7
3     0   to the left of    5
4     0   to the left of   13
5     0  to the right of   11
6     2  to the right of    3
7     2               on    5
8     2  to the right of   11
9     3   to the left of    9
10    3   to the left of    2
11    3   to the left of    0
12    3   to the left of    8
13    3   to the left of    5
14    4  to the right of    0
15    4  to the right of    5
16    4   to the left of    7
17    4  to the right of    9
18    5  to the right of   11
19    5   to the left of   13
20    5  to the right of    0
21    5  to the right of    3
22    5   to the left of    4
23    5   to the left of    7
24    7  to the right of    9
25    7  to the right of    5
26    7  to the right of    4
27    7  to the right of    0
28    7  to the right of   13
29    8  to the right of   11
30    8  to the right of    3
31    9   to the left of    7
32    9   to the left of    4
33    9  to the right of    3
34   11   to the left of    2
35   11   to the left of    5
36   11   to the left of    0
37   11   to the left of    8
38   13  to the right of    5
39   13   to the left of    7
40   13  to the right of    0