Rosy-billed pochard Rosy-billed pochard The rosy-billed pochard, alternatively named rosybill or rosybill pochard ("Netta peposaca"), is a duck with a distinctive red bill on males and a slate-colored bill on females. Though classified as a diving duck, this pochard feeds more like a dabbling duck. The species name "peposaca" is derived from a Guaraní word for "showy wings", referring to the broad white stripe that is only visible with stretched out wings. The rosy-billed pochard is endemic to South America. It is found in Argentina, central Chile, Paraguay, Uruguay and southern Brazil. The population in southern Argentina migrates northward during the austral
Bird-of-paradise lek-type mating system. Others, such as the "Cicinnurus" and "Parotia" species, have highly ritualised mating dances. Males are polygamous in the sexually dimorphic species, but monogamous in at least some of the monomorphic species. Hybridisation is frequent in these birds, suggesting the polygamous species of bird of paradise are very closely related despite being in different genera. Many hybrids have been described as new species, and doubt remains regarding whether some forms, such as Rothschild's lobe-billed bird of paradise, are valid. Birds-of-paradise build their nests from soft materials, such as leaves, ferns, and vine tendrils, typically placed in a tree