How can I escape the whale

Hint 1 of 7:

This is one of the toughest puzzles in the entire game.

Hint 2 of 7:

You will need the feather you found on Genesta's Island.

Hint 3 of 7:

The whale tongue, suprisingly, is not the same on both sides.

Hint 4 of 7:

You can climb along the left hand (western) top edge, until you stand.

Hint 5 of 7:

Then go to the near the center top.

Hint 6 of 7:

Look up, and then start tickling that uvula with your feather.