Pliny the Elder [1st century CE] (Natural History, Book 11, 45.125): - ..horns pointing towards the ground like those belonging to the trogodites, which consequently graze with the neck bent sideways. - [Rackham translation]

Thomas of Cantimpré [circa 1200-1272 CE] (Liber de natura rerum, Quadrupeds 4.102): Tragedites, as Pliny says, are wild beasts, which, contrary to all kinds of four-footed beasts, feed upon the earth by suddenly lowering their horns, with slanted necks. And this is the reason: they have long horns that hang down from the slope of the head and jaws to the ground. For this reason, they cannot feed on the ground as other wild beasts because of their hindering horns, but with their long necks bent, they seem to cut the grass with their mouths rather than to pick it after the manner of others. - [Badke translation/paraphrase]