One of the more mysterious mahika kai species is kākahi. These are our native freshwater mussels that live in rivers and lakes. Unlike marine mussels, they move around with a ‘foot’ and can often be spotted by finding the trails they leave behind them. Kākahi were traditionally valued as a reliable food source, as they generally stay in the same place and are available all year round. Kākahi shells are also valued for use in making muka (flax fibre), and were used to cut hair, umbilical cords, or even as rattles attached to manu aute (kites).