Minish

The Minish are a species found in The Legend of Zelda: The Minish Cap for the Game Boy Advance. As their name implies, they're a race of very tiny people that an adult Hylian would not be able to see. They're also known as Picori, which they are called by the people of Hyrule.

Apparently a Picori is no bigger than the thumb of Link. When the green-clad Link dawns the Minish Cap, he'll shrink to the miniature size of the Minish.