Are the animals of different types?
Yes, they are dogs and cows.
    src        edge_attr  dst
0     0   to the left of   21
1     0  to the right of    6
2     0   to the left of   27
3     1   to the left of    9
4     1   to the left of    6
..  ...              ...  ...
76   27  to the right of    0
77   27  to the right of   18
78   27   to the left of    7
79   27  to the right of   11
80   27  to the right of   10

[81 rows x 3 columns]