Are these animals of different species?
Yes, they are dogs and cows.
    src        edge_attr  dst
0     0               of   13
1     2  to the right of   16
2     2  to the right of    9
3     2  to the right of    3
4     2  to the right of   15
5     2  to the right of    7
6     3   to the left of    2
7     3   to the left of    6
8     3   to the left of    4
9     4  to the right of   16
10    4   to the left of   10
11    4  to the right of    3
12    5  to the right of    6
13    5   to the left of   10
14    6  to the right of    3
15    6   to the left of   10
16    6   to the left of    8
17    6  to the right of   16
18    6   to the left of    5
19    7  to the right of    9
20    7   to the left of    2
21    8  to the right of    6
22    8   to the left of   10
23    9   to the left of    2
24    9   to the left of    7
25   10  to the right of    4
26   10  to the right of    6
27   10  to the right of    8
28   10  to the right of    5
29   11               on    1
30   15   to the left of    2
31   15   to the left of   16
32   16  to the right of   15
33   16   to the left of    6
34   16   to the left of    4
35   16   to the left of    2