Mimis are fairy-like beings of Arnhem Land in the folklore of the Indigenous Australians of northern Australia. They are described as having extremely thin and elongated bodies, so thin as to be in danger of breaking in case of a high wind. To avoid this, they usually spend most of their time living in rock crevices. They are said to have taught the Aborigines of Australia how to hunt, prepare kangaroo meat and use fire. They are like humans but they live in a different dimension. They were depicted during the freshwater period (1200 kya).
Their name might come from the song of a Zebra Finch.