What kind of animal is the cow on?
The cow is on the calf.
    src        edge_attr  dst
0     3   to the left of   19
1     3   to the left of    4
2     3   to the left of   14
3     4  to the right of    3
4     4  to the right of   19
5     4   to the left of   14
6     6   to the left of    7
7     7  to the right of    6
8     8   to the left of   13
9    13  to the right of    8
10   14  to the right of   21
11   14  to the right of   19
12   14  to the right of    3
13   14  to the right of   15
14   14  to the right of    4
15   15   to the left of   14
16   15               on   14
17   18               in   20
18   19  to the right of    3
19   19   to the left of    4
20   19   to the left of   14
21   21   to the left of   14