All antelope have horns; in some species they are only found on the males, whereas in others, such as
gazelles, both males and females have them. The horns are made of a bony core encased in a hard material made largely of keratin (the same substance our fingernails are made of!). Horns are permanently attached, unlike a deer’s antlers, which are shed each year.
Some horns, like those of the addax and blackbuck, twist in interesting spirals; others are ridged or corrugated, like those of the impala and the sable antelope; still others grow in wide curves with a sharp point on the end, like those of the gnu.
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