Male ladybugs can spend up to four hours mating with a dead female before they realize something's not right.
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Male llamas bite off other male llamas' testicles to get rid of competitors during the mating season.
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Female Komodo dragons can impregnate themselves without a male through a process called "parthenogenesis" to force the duplication of sex chromosomes and give birth to male Komodo dragons; keeping the species alive.
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Female anacondas strangle and eat the males after mating so they can survive the seven months of fasting during their pregnancy.
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Female dragonflies fake their own death to prevent rape.
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Octopi are genetically wired to die soon after mating.
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Earthworms mate by joining their clitella (swollen area near the head of a mature worm) with another worm's clitella and exchanging sperm. Then each worm forms an egg capsule in its clitellum
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