Scorpion facts: Scorpions have been on Earth for 400 million years, scorpions give birth to live young and then catch them in their arms, and under ultraviolet light, scorpions fluoresce. Scientist and Cal Academy Curator of Arachnology Lauren Esposito explains it all in the videos above and below.

Watch more arachnid and biofluorescence videos on this site, including The Difference Between Bioluminescence and Fluorescence.

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