Are the animals of different types?
No, all the animals are sheep.
    src        edge_attr  dst
0     2               on   10
1     2   to the left of    8
2     2   to the left of   17
3     5   to the left of   16
4     6  to the right of   14
5     6  to the right of   11
6     6  to the right of   16
7     6  to the right of   13
8     8  to the right of    2
9     8   to the left of   17
10    9   to the left of   16
11   11   to the left of   18
12   11   to the left of    6
13   11   to the left of   15
14   11   to the left of   14
15   12   to the left of   18
16   13   to the left of   14
17   13   to the left of    6
18   13   to the left of   18
19   13   to the left of   15
20   14  to the right of   11
21   14  to the right of   13
22   14   to the left of   15
23   14   to the left of    6
24   15  to the right of   11
25   15  to the right of   13
26   15  to the right of   16
27   15  to the right of   14
28   16  to the right of    5
29   16  to the right of    9
30   16   to the left of   15
31   16   to the left of    6
32   17  to the right of    2
33   17  to the right of    8
34   18  to the right of   12
35   18  to the right of   13
36   18  to the right of   11