Poultry
In some countries, geese and ducks are force-fed to produce livers with an exceptionally high fat content for the production of "foie gras". Over 75% of world production of this product occurs in France, with lesser industries in Hungary and Bulgaria and a growing production in China. "Foie gras" is considered a luxury in many parts of the world, but the process of feeding the birds in this way is banned in many countries on animal welfare grounds.
Foie gras controversy
Animal rights and welfare activist groups such as the Humane Society of the United States and the Animal Legal Defense Fund contend that foie gras production methods, and force feeding in particular, consist of cruel and inhumane treatment of animals. Specific complaints include livers swollen to many times their normal size, impaired liver function, expansion of the abdomen making it difficult for birds to walk, death if the force feeding is continued, and scarring of the esophagus.