Cao's Duck Neck is a trademark applied by Chengdu Cao's Duck Neck Food Co., Ltd. at the China Trademark Office on July 13, 2017. Cao's Duck Neck is a brand of Chengdu Cao's Duck Neck Food Co., Ltd., which mainly includes zoo services. Career guidance (education or training consultant). Fitness coaching classes. Book publishing. educate. Vocational retraining. Entertainment services. Services such as club services (entertainment or education).