The pūrerehua is a taoka puoro known in English as the bullroarer. There are similar instruments used in many cultures across the world. They are usually made up of a flat disc of bone or wood attached to a piece of string and are played by swinging them around in the air very quickly. The sound comes from the disc winding and unwinding as it cuts through the air.

In Aotearoa, the pūrerehua can go by different names, including rangorango and huhū. What all these Māori names have in common is that they are different kinds of flying insects, as this is what they sound like when played. Pūrerehua means butterfly, rangorango means blowfly, and huhū refers to the huhu beetle. Pūrerehua are traditionally used to summon rain, and similar instruments like the poi āwhiowhio were used as a lure for birds.