Maybe someone can develop Leptin knockout ducks that would naturally overeat so they do not have to be force fed. The rodent strains and humans (rare, only a few cases) that have naturally occuring genetic mutations overeat and become obese. I think it would need to be done on the right strain of duck (Muscovy) so that they get fatty liver and not just a thicker fat layer under the skin (Pekin ducks). It could be a big money-maker based on the interest in maintaining a supply of Foie Gras. Would PETA still object if the ducks are not gavage fed? Reference for fat distribution on overfeeding S. Davail et al. Comparative Biochemistry and Physiology 134:707–715, 2003.