What are the brown animals?
The animals are dogs.
    src        edge_attr  dst
0     0  to the right of    4
1     0  to the right of    8
2     1   to the left of    6
3     2   to the left of   12
4     3  to the right of   15
5     3   to the left of    9
6     3  to the right of   11
7     3   to the left of   10
8     3  to the right of    8
9     3  to the right of    4
10    4   to the left of    3
11    4   to the left of    5
12    4   to the left of    0
13    5  to the right of    4
14    5  to the right of    8
15    6  to the right of    1
16    6   to the left of   10
17    8   to the left of    3
18    8   to the left of    0
19    8   to the left of    5
20    9  to the right of    3
21   10  to the right of    6
22   10  to the right of    3
23   11   to the left of    3
24   12  to the right of   14
25   12  to the right of   13
26   12  to the right of    2
27   13   to the left of   12
28   14   to the left of   12
29   15   to the left of    3