Are these animals of different types?
No, all the animals are birds.
    src        edge_attr  dst
0     0   to the left of    6
1     0   to the left of    2
2     2  to the right of    3
3     2  to the right of    0
4     3   to the left of    6
5     3   to the left of    2
6     3               on    2
7     6               on    2
8     6  to the right of    3
9     6  to the right of    0
10    7               on    2