Are the animals all of the same species?
Yes, all the animals are cows.
    src        edge_attr  dst
0     0   to the left of   17
1     0  to the right of    9
2     1  to the right of   20
3     1  to the right of   10
4     2   to the left of   11
5     2   to the left of    4
6     3   to the left of    7
7     3   to the left of    5
8     3   to the left of   12
9     4  to the right of   11
10    4  to the right of   16
11    4  to the right of   15
12    4  to the right of    2
13    5   to the left of   12
14    5  to the right of    3
15    5  to the right of   13
16    6  to the right of    9
17    6  to the right of   20
18    6           eating   18
19    6   to the left of    7
20    7  to the right of    3
21    7  to the right of    6
22    7   to the left of   12
23    7  to the right of   13
24    8  to the right of   14
25    9   to the left of    6
26    9   to the left of    0
27    9   to the left of   20
28    9   to the left of   17
29   10   to the left of   19
30   10   to the left of   14
31   10   to the left of    1
32   11  to the right of   16
33   11  to the right of    2
34   11   to the left of    4
35   12  to the right of    3
36   12  to the right of   13
37   12  to the right of    5
38   12  to the right of    7
39   13   to the left of    7
40   13   to the left of   12
41   13   to the left of    5
42   14  to the right of   10
43   14   to the left of    8
44   15   to the left of    4
45   16   to the left of   11
46   16   to the left of    4
47   17               by    9
48   17  to the right of    9
49   17  to the right of    0
50   17  to the right of   20
51   19  to the right of   10
52   20   to the left of    1
53   20   to the left of    6
54   20  to the right of    9
55   20   to the left of   17