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Tardigrades are extremophiles. The tiny invertebrates can survive in both low- and high-pressure environments, and in temperatures as low as minus 328ºF (-200ºC) and as high as 304ºF (151ºC). But these millimeter-long, multicelled organisms have always been too elusively small to sit for a portrait. This year, however, German scientists used an electron microscope to make a high-resolution photograph of a single tardigrade – revealing a creature that resembles both a bear and a piglet. This image was published in July’s Visions of Earth, a trio of photos that appear in each issue of National Geographic. (Photo by Eye of Science/Science Source/National Geographic)
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