This animal is very often miscalled the “aurochs,” and from this error much confusion has arisen. The true aurochs, (_Bos primigenius_), was the wild progenitor of some of the existing breeds of domestic cattle, but it is now extinct. MOUNTAIN SHEEP HILL, No. 44. The wild sheep and goats of the world form an exceedingly interesting group of animals. In form they are odd and picturesque, and in temper and mentality they are everything that could be desired. All the year round, deer are either nervous or dangerous, and difficult to handle. Wild sheep, goats and ibex appreciate man’s interest in them, and even when not fond of attention, they act sensibly when it is necessary to handle them. The Zoological Park collection of wild sheep and goats is one of the most interesting features of the Park. Mountain Sheep Hill is the first high ridge west of the Rocking Stone, and its northern end is very near the Bear Dens and Reptile House. It consists of a ridge of pink granite 500 feet long and 25 feet high, its southern end fully exposed, but the northern end well shaded by oaks and cedars. For grazing animals that love to climb, and pose on the sky line, the slopes of bare rock, set in patches of hard, green turf, are almost ideal. In the eastern face of the ridge, rock excavations have been made, and five roomy caves have been constructed in such a manner that they are cool in summer, warm in winter, and dry at all times. On April 1, 1913, the six wire enclosures on Mountain Sheep Hill contained the following species: [Illustration: WHITE-FRONTED MUSK-OX.] [Illustration: BIG-HORN MOUNTAIN SHEEP RAM.] Suleiman Markhor. Arcal Mountain Sheep. Mouflon. Persian Wild Goat. Himalayan Tahr. Aoudad. Because of the curious (and unaccountable) fact that they do not thrive on Mountain Sheep Hill, the Rocky Mountain Goat and Chamois are exhibited elsewhere. The former will be found near the Pheasant Aviary, next to the Musk-ox. Visitors are requested to make note of the fact that _in winter_, the _Arcal Sheep, Mouflon, and other delicate sheep are exhibited in the Small-Deer House_. The White-Fronted Musk-Ox, (_Ovibos wardi_, Lydekker), is represented in the Park by a herd of six specimens. Five of these animals were born in May, 1910, in Ellesmere Land, and captured in that year by Paul J. Rainey and Harry C. Whitney, and presented by Mr. Rainey. The sixth individual, a vigorous and rather vicious female, was born on Melville Island, in May, 1909, and captured by Captain Joseph Bernier. Owing to the domineering temper of “Miss Melville,” it is not possible to keep her with the animals a year younger than herself, because she resents their presence in her corral.