This robot-looking spider-like particle is actually a virus attacking E. coli bacteria. It's called a T4 Phage, and it actually does have spindly legs. It delivers a package of viral RNA into a host cell, shown here as the red strand by illustrator Jonathan Heras, which is used by the host cell to create new viral proteins.
http://www.npr.org/blogs/pictureshow/2011/02/22/133868260/sciviz
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