Are the animals of different species?
Yes, they are geese and birds.
    src        edge_attr  dst
0     0  to the right of    5
1     0  to the right of   11
2     1  to the right of   14
3     1  to the right of   13
4     1  to the right of    2
5     2   to the left of    1
6     5  to the right of    9
7     5   to the left of    0
8     6   to the left of   11
9     6   to the left of   12
10    8  to the right of    9
11    9   to the left of    5
12    9   to the left of    8
13    9   on the side of   10
14   10             near   11
15   11   to the left of    0
16   11  to the right of    6
17   11             near   10
18   12  to the right of    6
19   13     hanging from    2
20   13   to the left of    1
21   14   to the left of    1