What is the name of the animal that is gray?
The animal is an elephant.
    src        edge_attr  dst
0     0  to the right of   12
1     1             near   14
2     1             near   12
3     1  to the right of    6
4     2  to the right of   15
5     2  to the right of   10
6     3   to the left of   12
7     4               in    9
8     4             near   14
9     4               in   21
10    6   to the left of   12
11    6   to the left of    1
12    6   to the left of   14
13    7      in front of   13
14   10   to the left of    2
15   11  to the right of   17
16   12  to the right of    3
17   12             near    1
18   12   to the left of   13
19   12  to the right of    6
20   12  to the right of   18
21   12   to the left of    0
22   13  to the right of   12
23   13           behind    7
24   14  to the right of    6
25   14             near    1
26   14             near    4
27   15   to the left of    2
28   17   to the left of   11
29   18   to the left of   12