Once called the "Dutchmen" because of their large noses and large bellies, proboscis monkeys live only in Borneo. Ecosystems that have a lot of diverse animals, like this monkey, also tend to have a lot of diverse viruses. Charles Ryan hide caption

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Charles Ryan

Why Killer Viruses Are On The Rise

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Bacteriophages, in red, look like tiny aliens, with big heads and skinny bodies. They use their "legs" to stick to and infect a bacterial cell, in blue. Biophoto Associates/Science Source hide caption

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Biophoto Associates/Science Source

Your Gut's Gone Viral, And That Might Be Good For Your Health

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These are insect cells infected with the Guaico Culex virus. The different colors denote cells infected with different pieces of the virus. Only the brown-colored cells are infectious, because they contain the complete virus. Michael Lindquist/Cell Press hide caption

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Michael Lindquist/Cell Press