What are the animals that are below the sky?
The animals are birds.
    src edge_attr  dst
0     0   next to    2
1     0     below    1
2     0    beside    2
3     0      near    2
4     0   next to    5
5     0      near    5
6     1     above    5
7     1     above    2
8     2      near    0
9     3  close to    5
10    4     below    5
11    5      near    0