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Sharks have been basically unchanged for millions of years. Essentially a torpedo with teeth, the shark is a creature incredibly honed to its particular ecological niche of eating stuff while swimming fast. Though, according to the theory of evolution, it was created through a confluence of random events–millions of generations of slight variations and mutations slowly selecting for the best combination of elements–it was fine-tuned through that process to create something incredibly powerful and deadly. No adjustments have been needed since dinosaurs roamed the earth.
There are parasites that invade and take over the brains of ants, or eat and replace the tongues of fish. There are predators whose hides mimic the way sunlight dapples a forest floor to make it more difficult to pick them out among the foliage as they sneak up on you. There are insects that have grown for millennia to the specific purpose of using the flesh of another creature to house and feed their young, often while that creature is still alive and aware of what is happening to it.
Evolution is scary.
