Owl Pack Level 3 sliding puzzle in 17 moves

This is the fastest solution I've found for the puzzle, but there may be faster solutions.
Squares are named after their location on a 1-9 grid, with 3 and 8 missing (replaced by 0):
Start:
6 9 0
2 1 7
5 4 0
Move 1: Move 7 down
6 9 0
2 1 0
5 4 7
Move 2: Move 9 right
6 0 9
2 1 0
5 4 7
Move 3: Move 6 right
0 6 9
2 1 0
5 4 7
Move 4: Move 9 down
0 6 0
2 1 9
5 4 7
Move 5: Move 6 right
0 0 6
2 1 9
5 4 7
Move 6: Move 1 up
0 1 6
2 0 9
5 4 7
Move 7: Move 1 left
1 0 6
2 0 9
5 4 7
Move 8: Move 2 right
1 0 6
0 2 9
5 4 7
Move 9: Move 2 up
1 2 6
0 0 9
5 4 7
Move 10: Move 4 up
1 2 6
0 4 9
5 0 7
Move 11: Move 4 left
1 2 6
4 0 9
5 0 7
Move 12: Move 5 right
1 2 6
4 0 9
0 5 7
Move 13: Move 5 up
1 2 6
4 5 9
0 0 7
Move 14: Move 7 left
1 2 6
4 5 9
0 7 0
Move 15: Move 7 left
1 2 6
4 5 9
7 0 0
Move 16: Move 9 down
1 2 6
4 5 0
7 0 9
Move 17: Move 6 down
1 2 0
4 5 6
7 0 9
Goal reached.