The animal near the rock is walking on what?
The zebra is walking on the ground.
    src        edge_attr  dst
0     1   to the left of   19
1     1   to the left of   10
2     1   to the left of    7
3     2  to the right of    5
4     3   to the left of    8
..  ...              ...  ...
84   19   to the left of   20
85   20  to the right of    4
86   20  to the right of   19
87   20   to the left of   15
88   20  to the right of   10

[89 rows x 3 columns]