[93] There are at least nine species of duck-like birds in New Zealand. The four specially cited by Cook are probably classified as follows, in the order mentioned by him: _Fuligula novœzelandiæ_, the New Zealand scaup; _Anas superciliosa_, the New Zealand mallard; _Hymenolæma malacorhynchus_, the celebrated "Blue duck" of New Zealand (though it is not strictly speaking a duck but more related to the slender-billed merganser and smew); _Nyroca australis_, the Australian pochard. The remaining five species are the New Zealand ruddy sheldrake (_Casarca_), a tree duck (_Dendrocygna_), a shoveller (_Spatula_), and two teal (_Elasmonetta_ and _Nettion_). But New Zealand once possessed black swans like those of Australia, and a huge flightless goose (_Cnemiornis_) like the existing Cereornis goose of Australia, and a musk duck (_Bizuira_). But all these became extinct long before the white man came on the scene. Cook also noticed the characteristic wingless rails of New Zealand, which he called wood hens. "As they cannot fly they inhabit the skirts of the woods, and feed on the seabeach; and are so very tame or foolish as to stand and stare at us till we knocked them down with a stick."[94] The natives were even then fast destroying them. Amongst the small birds Cook particularizes the wattle-bird, poë-bird, and fan-tail, on account of their singularities of form and plumage.[95] [94] The Weka-rails, _Ocydromus_. There was also a monster Porphyrio, the _Notornis mantelli_, unable to fly, and consequently soon killed out by the colonists.