What kind of animal is it?
The animal is a bull.
   src        edge_attr  dst
0    1   to the left of    2
1    2  to the right of    1
2    3  to the right of   12
3    3  to the right of    4
4    4   to the left of    3
5    4  to the right of    9
6    6  to the right of   11
7    9   to the left of    4
8   11   to the left of    6
9   12   to the left of    3