The Rufous hornero (Furnarius rufus, or red ovenbird) is known in Brazil and South America as joão-de-barro. It's native of this area, and it builds its nest with clay, straw and leaves, usually on trees. The picture shows a red ovenbird with its beak dirty with clay, fixing the walls of its nest, constructed on a Pau-ferro tree (Libidibia ferrea, or Brazilian ironwood).