The New Zealand fernbird or simply fernbird (Megalurus punctatus) is an insectivorous bird endemic to New Zealand. The Māori names are kōtātā or mātātā. It is a rich brown above and white below, with brown spots on both the throat and breast. Early settlers called it the “swamp sparrow” no doubt because of its colouration. The tail feathers are thin, dark brown, and spine-like. The birds reach a length of 18 cm (7 in) - as measured from tip of beak to end of tail. However,almost half of that is tail. (source)