Are there zebras in this picture that are not happy?
Yes, there is a sad zebra.
    src        edge_attr  dst
0     0           behind    6
1     2  to the right of   13
2     2  to the right of   18
3     2   to the left of   15
4     2   to the left of    3
..  ...              ...  ...
67   26   to the left of   24
68   26   to the left of   22
69   26   to the left of   11
70   26   to the left of   13
71   26   to the left of   18

[72 rows x 3 columns]