Do these animals have different species?
Yes, they are alligators and dinosaurs.
    src        edge_attr  dst
0     1   to the left of   21
1     1   to the left of   19
2     1   to the left of    8
3     1  to the right of   13
4     2   to the left of   20
..  ...              ...  ...
64   22   to the left of   12
65   22   to the left of    8
66   23  to the right of   19
67   23  to the right of   21
68   23  to the right of   17

[69 rows x 3 columns]