Are these birds or cats?
These are birds.
   src        edge_attr  dst
0    0   to the left of    5
1    1   to the left of    4
2    4  to the right of    1
3    5  to the right of    0
4    5  to the right of    8
5    6  to the right of    9
6    8   to the left of    5
7    9   to the left of    6