For 10 points, identify these ungulate animals whose Bactrian and dromedary varieties differ in their number of humps.
These animals are the namesake of the only family of mammals to possess heavy-chain antibodies. Their earliest-known ancestor was the North American Protylopus. The males of one species of these animals can inflate a large pink organ in their throats called a dulla, which hangs out of the mouth in mating displays. These mammals have oval-shaped red blood cells that can expand to more than twice their normal size. A management program headquartered in Alice Springs is dedicated to reducing the feral population of these animals in central (*) Australia. Recent findings on Ellesmere Island suggest that, counterintuitively, a cold climate may have been the reason they developed their characteristic fat deposits. For 10 points, identify these ungulate animals whose Bactrian and dromedary varieties differ in their number of humps.
These animals are the namesake of the only family of mammals to possess heavy-chain antibodies.
camels [accept Camelus or camelidae; accept Bactrian camels or dromedary camels or Arabian camels] &lt;Carson&gt;