Stefan Mileschin

When you hear the word "bacteria," you probably picture organisms that couldn't be seen unless they're placed under a microscope. A bacterium that has now been classified as the largest in the world ever discovered, however, needs no special tools to be visible to the naked eye. Thiomargarita magnifica, as it's called, takes on a filament-like appearance and can be as long as a human eyelash. As the BBC notes, that makes it bigger than some more complex organisms, such as tiny flies, mites and worms. It was first discovered by marine biologist Olivier Gros living on sunken mangrove tree leaves in the French Caribbean back in 2009.

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