Do these animals have different species?
Yes, they are cows and bulls.
    src        edge_attr  dst
0     0      in front of    3
1     2  to the right of   13
2     2   to the left of   16
3     2  to the right of    3
4     2  to the right of    8
5     3   to the left of    2
6     3               in   11
7     3  to the right of    5
8     3           behind    0
9     4  to the right of    7
10    5   to the left of    8
11    5   to the left of    3
12    5   to the left of   13
13    5   to the left of   15
14    7   to the left of    4
15    8  to the right of    5
16    8   to the left of    2
17   12   to the left of   16
18   13   to the left of    2
19   13  to the right of    5
20   15  to the right of    5
21   16  to the right of   12
22   16  to the right of    2