Day 9: How to tickle a giant?

On the floor laid the chain of sausages that bounded the giant, soft cushy and delicious looking. That could work to reach her, thought Louie as he headed down the stairs and pulling them up mid stairs to where the giant's sides were.

Now how should I tickle her with these? Louie thought to himself. He started testing tickling himself by poking his own sides, but that didn't work. He remembered how his sisters used to tickle him, usually by some sort of unexpected poke at his sides. With that in mind, he chewed off a piece of sausage and tried throwing it to the giant's side, hoping it'd make her laugh.

"What was that?"

"I'm trying to tickle you!"

"I didn't feel much actually. Sad to say, I have a high tolerance for tickles despite it being the only thing that would change me back."

Louie tried throwing a few more sausages at her sides.

"Nope not working."

Dejected, Louie tried to think harder what else could make someone ticklish? If something cushy didn't work, maybe it was too thick? What about something softer, lighter?

Louie headed down the stairs and went out of the house. He looked up and saw birds flying in the sky. Now how can I get some feathers...