Where does the bird stand on?
The bird stands on the ground.
    src        edge_attr  dst
0     1   to the left of    5
1     3   to the left of    5
2     3   to the left of    7
3     4   to the left of    5
4     4   to the left of    9
5     4   to the left of    7
6     5  to the right of    3
7     5  to the right of    1
8     5  to the right of    4
9     7  to the right of    3
10    7  to the right of    4
11    7      standing on    0
12    9               of    7
13    9  to the right of    4