Are all the animals of the same species?
No, there are both horses and dogs.
     src        edge_attr  dst
0      0   to the left of   18
1      0   to the left of   17
2      0   to the left of    8
3      0   to the left of    2
4      0  to the right of   14
..   ...              ...  ...
137   22   to the left of   11
138   22       looking at    6
139   22   to the left of   10
140   22   to the left of    9
141   22               on    5

[142 rows x 3 columns]