What kind of animal is in front of the trees the leaves are on?
The animals are zebras.
    src        edge_attr  dst
0     1  to the right of   17
1     1  to the right of   10
2     1  to the right of   13
3     1               by   14
4     1  to the right of    7
5     4               on   17
6     7   to the left of    1
7     7      in front of   14
8     8  to the right of   17
9    10   to the left of   19
10   10   to the left of    1
11   11               by   18
12   12  to the right of   16
13   12  to the right of   13
14   13   to the left of   12
15   13   to the left of    1
16   13  to the right of   16
17   14           behind    7
18   15               on   14
19   16   to the left of   17
20   16   to the left of   13
21   16   to the left of   12
22   17   to the left of    8
23   17   to the left of    1
24   17  to the right of   16
25   19  to the right of   10