National Geographic : 1939 Oct
©Reginald A.Bourlay UNWIELDY HIPPOPOTAMUSES, MILD AND INOFFENSIVE, MILL ABOUT IN THE COOLING WATERS OFTHE SUNGUE RIVER Roar of the airplane motor only slightly disturbs this East African herd in quiet search for underwater plants, afavorite diet. When wounded, ordefending their young, the bulky beasts are remarkably agile and immensely strong. Sometimes the old bulls, like elephants,become "rogues" and attack anything and every thing within sight. Hides of the huge animals are two inches thick in places and are virtually hairless.