Cornimer (ドンどんぐり Dondonguri) is a tortoise that appears in the Animal Crossing series. He only comes out during the Acorn Festival in Wild World, and gives the player mushroom furniture, walls, and floors in exchange for acorns, which are obtained by looking under oak trees during the festival. However, if the player gives him a rotten acorn, he will say that all the other acorns the player gave him that time don't count. Much like Tortimer telling the player's fortune by using fireworks he can tell the player's fortune by using acorns, as shown below. It is believed by many that Cornimer is Tortimer wearing a mask.