Toulouse goose, also known as Ximeng goose, is the largest goose species in the world. It was domesticated and bred by gray geese in the early19th century. Originated in the suburbs of Toulouse in southern France, mainly distributed in southwest France. Later, it was introduced to Britain, the United States and other European and American countries. Goose tends to deposit fat, which is used to produce fatty liver and goose oil. The average fatty liver weight of each goose can reach more than 1 kg, generally 1- 1.3 kg, and the maximum fatty liver weight is 1.8 kg. It used to be a traditional variety of goose fatty liver.

Toulouse goose is big and full of feathers, which has the characteristics of heavy goose. The head is big, the beak is pointed, the neck is thick, the length is medium, the body is horizontal, the chest is wide and deep, and the legs are short and thick. There is a pharyngeal pouch formed by drooping skin under the mandible and a belly wrinkle under the abdomen. Pharyngeal pouch and abdominal wrinkles have appeared. Feathers are gray and fluffy, the head is gray, the neck and back are dark gray, the chest is light gray and the abdomen is white. The wing feathers are dark gray, the edges are light, and the tail feathers are gray. The beak is orange and the legs are orange. Dark brown or reddish brown eyes.