Life Woolly mammoths had testosterone surges like those of male elephants Hormone measurements from the tusk of a male woolly mammoth show these animals went through musth, a seasonal peak in testosterone seen in elephants NewsFree
Life Trilobites used trident-like horns to fight over mates like stags Three-pronged weapons on the heads of Walliserops fossils suggest that animals first duelled in sexual combat at least 400 million years ago NewsFree