Maiamai

These creatures are the children of Mother Maiamai, lost and scattered across the lands of Hyrule and Lorule. When Link first meets Mother Maiamai, she pleas for the hero to collect her children and return them, promising rewards in exchange. For every ten lost Maiamais Link finds, Mother Maiamai will upgrade one of his items (provided he owns the weapon and is not merely renting). In total, one hundred lost Maiamais can be found in the overworlds of A Link Between Worlds.

Collection
Maiamais are littered across the land, requiring a variety of maneuvers to capture them, such as using the Pegasus Boots, using the Tornado and Sand Rods, discovering them underneath Rocks and Grass, and transforming into a painting behind them on walls.

Trivia

 * If Link stands near the Maiamai, he will turn his head and stare to where is the Maiamai is at. Useful to find their exact location when looking for them when they are hidden. It also works when Link and the Maiamai are at different elevations.