Do the animals have different species?
No, all the animals are chicken.
    src        edge_attr  dst
0     0  to the right of    2
1     0   to the left of    1
2     1  to the right of    3
3     1  to the right of    2
4     1  to the right of    0
5     2   to the left of    0
6     2   to the left of    1
7     3   to the left of    1
8     4   to the left of    6
9     5   to the left of    6
10    6  to the right of    5
11    6  to the right of    4