The common name of this animal is Pato serrucho and the scientific name is Mergus octocetaseus. This animal belongs to the bird family and we can find it in different places of Argentina: North of Misiones, Uruguay River, Tigre River and Iguazu River.
It is a black bird with two distinctive features, its beak with two teeth in its inferior jaw and 70 in the upper one and a crest, which is 10 centimeters long.
Its upper parts are dark grey, its breast pale grey and it has orange legs. In flight, the white on the wings is very noticeable. It requires shallow, fast flowing rivers with clear waters in which it catches fish by diving. These rivers have to flow through areas of forest, so that these birds can build their nests in tree cavities.
It is in extinction because it is preyed by eagles and because the tropical forest where it lives is being destroyed. There may be less than 200 birds left.

Written by: Cesar and Jeronimo