DAMN, nature, you scary!
To add my own terrifying nature shit (and I have plenty more), I present to you: Anglerfish mating.
http://www.youtube.com/watch?v=Lsmxs0uDXMo
From Wikipedia (close enough):
At birth, male ceratioids are already equipped with extremely well developed olfactory organs that detect scents in the water. The male ceratoid lives solely to find and mate with a female. They are signifantly smaller than a female angler fish, and have trouble finding food in the deep sea. This necessitates his quickly finding a female anglerfish to prevent his death. The sensitive olfactory organs help the male to detect the pheromones that signal the proximity of a female anglerfish. When he finds a female, he bites into her skin, and releases an enzyme that digests the skin of his mouth and her body, fusing the pair down to the blood-vessel level. The male then slowly atrophies, first losing its digestive organs, then its brain, heart, and eyes, and ends as nothing more than a pair of gonads, which releases sperm in response to hormones in the female's bloodstream indicating egg release. This extreme sexual dimorphism ensures that, when the female is ready to spawn, she has a mate immediately available.



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