Bark Lice.

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A herd of bark lice (Psocoptera: Cerastipsocus sp.) grazes lichen across a tree trunk near Córdoba, Argentina. Here's what one of the adorable little beasties looks like up close:

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Technical details:

Lens: Canon MP-E 1-5x macro lens, at about 1x (top photo) and 4x (bottom photo).
Body: Canon EOS 20D
Flash: Canon MT-24EX twin-flash, diffused through tracing paper (bottom photo), or held behind tree to backlight the psocids (top photo).
Settings: ISO 100, f/13, 1/250 sec.

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