Are these animals of different species?
Yes, they are monkeys and elephants.
    src        edge_attr  dst
0     0   to the left of    8
1     0   to the left of    2
2     0   to the left of    4
3     0   to the left of   12
4     1  to the right of   19
..  ...              ...  ...
75   19  to the right of   11
76   19   to the left of    3
77   19   to the left of    1
78   19   to the left of   15
79   19  to the right of   10

[80 rows x 3 columns]