Four families--1st, _Hornless Ruminants_, Camels, Musks; 2nd, _Cervidae_, true horns shed periodically, Deer; 3rd, _Persistent horns_, Giraffes; 4th, _Hollow-horned Ruminants_, Antelopes, Goats, Sheep and Oxen.   anvd [Please select]

Many tests of scents, both prepared baits and various animal musks, have been made with wolves in the field and in the National Zoological Park.   anvd [Please select]