Taniwha is the Maori word for monster.
I think Taniwha don't exists because It doesn't feel like there are any unless someone dresses another person into scary cloths. I am kind of 50 50 because it depends on what taniwha because some people call big animals taniwhas especially big fish! On this clip I think it is not a taniwha it might be a pipe that has broken maybe but I don't think it's a monster.