The bare-throated bellbird ('Procnias nudicollis') is a species of bird found in moist subtropical and tropical forests in Argentina, Brazil, and Paraguay.

Their plumage is sexually dimorphic: the male bird has striking white plumage and a bare bluish-black patch of skin around its eyes and beak and on its throat. The female is duller in colour with a black crown, olive-brown upper parts and yellowish underparts streaked with olive green. This bird is about 27 cm (11 in) long.

It is threatened by habitat loss and by poaching for cage birds. It raises the attraction of collectors because of the adult males's showy coloration. Its conservation status is vulnerable. A fruit-eating species, it acts in the ecology of the Atlantic rainforest as a dispersor of seeds

The male has one of the loudest calls of any bird - a sharp sound like that of a hammer striking an anvil or a bell, emitted by the male while it perches on a high branch in order to attract a mate.

The bare-throated bellbird is the national bird of Paraguay and it is different from the bellbirds of Central America regarding shape, size, and living habitat. All of the bellbirds are tropical and have loud voices. However, bare-throated bellbirds are considered the loudest ones.

More Info: en.wikipedia.org