Are the animals all of the same type?
Yes, all the animals are sheep.
    src        edge_attr  dst
0     1               in   19
1     2   to the left of    6
2     3  to the right of   27
3     3  to the right of   16
4     3  to the right of   25
5     3  to the right of   23
6     4   to the left of   14
7     5               in   19
8     6  to the right of    2
9     8   to the left of   11
10   11  to the right of    8
11   14  to the right of    4
12   16   to the left of    3
13   17       covered by   19
14   18  to the right of   24
15   18  to the right of   21
16   18  to the right of   28
17   19               on    4
18   19         covering   17
19   20               in   19
20   20  to the right of   28
21   20  to the right of   21
22   21   to the left of   18
23   21               in   19
24   21   to the left of   20
25   21   to the left of   24
26   23   to the left of   27
27   23   to the left of    3
28   24  to the right of   28
29   24   to the left of   18
30   24  to the right of   21
31   25   to the left of    3
32   25   to the left of   27
33   26               in   19
34   27   to the left of    3
35   27  to the right of   25
36   27  to the right of   23
37   28   to the left of   24
38   28   to the left of   20
39   28   to the left of   18