National Geographic : 1939 Oct
©Reginald A.Bourlay BILLIARD BALL MAKER S DREAM-A TON OF IVORY IN THE RAW ON THEGORONGOSA PLAINS Tusks of African bull elephants average about 40 pounds apiece. Those weighing 100 pounds are not rare. One hasbeen recorded which weighed 235 pounds and had a circumference of 26 inches. Old bulls with big tusks find it difficult to keep up with the herd. Sometimes they lodge thebigteeth inforks oftrees togive their weary neck muscles a rest.