Which birds grow down for bedding articles?

Down is the plumage forming the undercoating of waterfowl, they form a heat-insulating layer in the depth of the plumage. Down can only be found at the chest and the abdominal area of the birds whilst feathers cover the whole body.
 

The entire plumage of a goose consists of about 300 g down and feathers. Thereof, approx. 60 g are fine chest plumage with down.
 

Only down of geese and ducks are used. Swans (protected species), for example, are out of the question as suppliers for down. Landfowl, as for instance chickens and turkey hens, do not possess any down.