A Columbia University researcher named Huntington who has researched the anatomy of digestion notes that carnivorous animals 'digestive tracts are short, whereas human intestines are 4-6 meters long, with numerous folds.
美國哥倫比亞大學韓丁頓博士，曾解剖分析腸道，發現肉食性動物的消化道短；草食性動物的消化道長。