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Adult male echidnas 🦔 have a unique four-headed penis, a specialized reproductive organ used for mating, where they alternate using two heads at a time. This adaptation is thought to increase fertilization success during intense competition when multiple males form “mating trains” behind a single female, each waiting for a chance to reproduce. Only two heads are used per erection [Read more] @googlefactss#mammals#sexuality#mating#natureisbeautiful