We've all had some bad times in the sack - sure - but none compare to this. After a round of mating (presumably, bad mating) the female spider will cannibalize the male spider. Not exactly romantic, right? In the case of the orb-web spider, only 30 per cent of males survive their first sexual encounter. Getty Images
Bad break up
When a male anglerfish finds a female, he bites down on her body and releases an enzyme that corrodes their flesh until they fuse together. By the time the process is finished, all that's left of the man is his gonads (his balls). The male dies, and leaves the female with a pair of testicles hanging off her.Getty Images
Something you ate?
When threatened, the Malaysian Ant literally self-destructs. Two poison-filled glands run the length of the bug's body. If a fight takes a turn for the worse, the insect contracts its abdomen which sends the poison gushing and spraying outward. Take one for the colony, right? ThinkStock
Some defence mechanism...
Your typical bee has a pretty tough decision to make when threatened: If it stings, it leaves its victim with an annoying red bump. In exchange, the bees digestive system is ripped out of its body, leaving it to die an extremely slow and painful death as it flies around missing its entire bottom half. Getty Images
You're only as good as your husband
If female ferrets don't find a mate when they're in heat, they can die. The mammals secrete high levels of estrogen, and if the unsatisfied hormone floats around in the bloodstream for too long, it will cause a progressive depression of bone marrow. And yeah, that's fatal.ThinkStock
Giving birth through a straw
The female spotted hyena gives birth through what's called a 'pseudo-penis,' and it's exactly what it sounds like. Instead of having like, an opening, the mother basically gives birth through a straw. It's so tiny, that about 60 per cent of her litter won't even survive the trip. Getty Images
You'll never look at rats the same way again
A rat's teeth grow extremely quickly. They literally have to keep chewing on hard objects all the time just to keep them at a manageable size. What happens if they don't? Their teeth will grow into their head, eventually penetrating their skull and brain.ThinkStock
Don’t cheat, or else
If you're a house sparrow, the stakes of infidelity are high - like, really high. The bird has this tendency to seek out the nest of another female that her partner has been sleeping with. Once she finds it, she kills that female's young to ensure that the male only spends time with her. "Don't mess with my man, yo."Getty Images