Scientists recently announced the naming of Brookesia micra, the smallest known chameleon on an island near Madagascar. It's seen here on the tip of a match. Biologists overlooked it before because it doesn't move much. From Science News

But the chameleon is a giant compared to the fairy wasp, one of the smallest insects, seen here next to a paramecium and an amoeba at the same scale. It only has 7,400 neurons, but that's enough to allow it to fly on its delicate wings, find food, and lay its eggs. From the Discover blog
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Thanks, Roger.
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