Are these animals of different species?
Yes, they are geese and horses.
    src        edge_attr  dst
0     0  to the right of    3
1     1  to the right of   10
2     1  to the right of    3
3     3   to the left of   10
4     3   to the left of    0
5     3   to the left of    1
6     6  to the right of    9
7     6   to the left of    8
8     8  to the right of    6
9     9   to the left of    6
10   10  to the right of    3
11   10   to the left of    1