George Perkins Marsh

“{{cite web|title=Conservationist George Perkins Marsh|publisher=Vermont History (vermonthistory.org)|url=https://vermonthistory.org/conservationist-george-perkins-marsh-vermont-history}}”

“{{cite web|title=The Marsh Collection|website=Smithsonian Institution|url=https://www.si.edu/spotlight/marsh-collection}}”

“The general anatomy of the camel is the same as that of other ruminants; but the hump, the horizontal posture of the head, the direction of the eye, the power of closing the nostril, the callosities upon the breast and legs, the spreading and cushioned feet, and above all the curious structure of the stomach, to which he owes his most valuable property, the power of long abstinence from water, distinguish him from all other quadrupeds.”