Antlers are extensions of the skull grown by members of the deer family. They are true bone structures that usually grow in symmetrical pairs. In most species, only the male grows antlers and their primary function is to increase his likelihood of sexual selection by attracting females or helping him fight other males. In many temperate zone species, antlers are shed and regrown each year.

https://en.wikipedia.org/wiki/Antler

"Better by far to embrace the hard truth than a reassuring fable."
Carl Sagan
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