What is the gray bird perched on?
The bird is perched on the tree.
    src        edge_attr  dst
0     0   to the left of    9
1     0   to the left of    4
2     0   to the left of   14
3     0   to the left of   10
4     1   to the left of    5
5     1   to the left of    2
6     1   to the left of    8
7     1       perched on   14
8     2  to the right of    1
9     2  to the right of   12
10    2  to the right of    7
11    4   to the left of   14
12    4   to the left of    5
13    4  to the right of    0
14    4  to the right of    6
15    4   to the left of    8
16    4   to the left of    7
17    4   to the left of   11
18    4   to the left of   10
19    4   to the left of   13
20    4   to the left of   12
21    5  to the right of    1
22    5  to the right of    4
23    5  to the right of   13
24    6   to the left of    4
25    7  to the right of    4
26    7   to the left of    2
27    8  to the right of    4
28    8  to the right of    1
29    8  to the right of   13
30    9   to the left of   14
31    9   to the left of   10
32    9  to the right of    0
33   10            above   12
34   10  to the right of    0
35   10  to the right of    9
36   10  to the right of    4
37   11  to the right of    4
38   12       perched on   14
39   12   to the left of    2
40   12  to the right of    4
41   12            below   10
42   13   to the left of    5
43   13   to the left of    8
44   13  to the right of    4
45   14  to the right of    0
46   14  to the right of    4
47   14  to the right of    9