The Brazilian Merganser is a critically endangered species of duck native to Brazil. It is characterized by its striking black and white plumage, with a distinctive crest on its head. This bird primarily inhabits freshwater rivers and streams, preferring areas with dense vegetation for nesting and foraging. These mergansers are known for their diving abilities, using their sharp bills to catch fish and invertebrates. Conservation efforts are underway to protect their habitat and increase their population, as habitat loss and pollution pose significant threats to their survival.