Scientists have stumbled upon four new species of tarantulas whose males have such outrageously long genitals that they had to invent an entirely new genus to classify them: Satyrex, named after the mythological satyr—half-man, half-goat, all libido—and the Latin word for king, rex. The males of the newfound species boast palps (spider sperm-delivery appendages) that stretch up to four times …
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