Are the animals of different types?
Yes, they are mooses and elephants.
    src        edge_attr  dst
0     0   to the left of    3
1     0  to the right of    6
2     1   to the left of    6
3     2  to the right of   13
4     2  to the right of   11
5     3  to the right of    5
6     3  to the right of    0
7     5  to the right of    6
8     5          holding    0
9     5   to the left of    3
10    6   to the left of    0
11    6  to the right of    1
12    6   to the left of    5
13    8   to the left of   13
14    8   to the left of   11
15    8  to the right of   10
16    8          holding   12
17    9  to the right of   10
18   10   to the left of    8
19   10   to the left of   14
20   10   to the left of   12
21   10   to the left of    9
22   11  to the right of   12
23   11  to the right of    8
24   11  to the right of   14
25   11   to the left of    2
26   12   to the left of   11
27   12  to the right of   10
28   13               on   11
29   13   to the left of    2
30   13  to the right of    8
31   13  to the right of   14
32   14  to the right of   10
33   14   to the left of   11
34   14   to the left of   13