Do the animals have different types?
No, all the animals are sheep.
    src        edge_attr  dst
0     0  to the right of    4
1     0  to the right of    1
2     1  to the right of    4
3     1   to the left of    0
4     2  to the right of   10
5     2               in   16
6     2  to the right of    8
7     2  to the right of    7
8     4   to the left of    1
9     4   to the left of    0
10    4   to the left of   13
11    4   to the left of   12
12    4   to the left of   17
13    5               of    4
14    6  to the right of    8
15    6  to the right of   10
16    6  to the right of    9
17    7  to the right of   15
18    7   to the left of    2
19    8   to the left of    6
20    8   to the left of    2
21    8  to the right of   15
22    8   to the left of    9
23    9   to the left of    6
24    9  to the right of    8
25   10   to the left of    6
26   10   to the left of    2
27   10  to the right of   15
28   11               of    6
29   12  to the right of    4
30   13   to the left of   17
31   13  to the right of    4
32   15   to the left of   10
33   15   to the left of    8
34   15   to the left of    7
35   17               of   10
36   17  to the right of   13
37   17  to the right of    4