Are these animals of different types?
No, all the animals are zebras.
     src        edge_attr  dst
0      0  to the right of   31
1      0   to the left of   34
2      0   to the left of    8
3      0   to the left of   13
4      0   to the left of   29
..   ...              ...  ...
168   34   to the left of   12
169   34   to the left of   32
170   34   to the left of   24
171   35   to the left of    3
172   35   to the left of    9

[173 rows x 3 columns]