A herd of bark lice (Psocoptera: Cerastipsocus sp.) grazes lichen across a tree trunk near CÃ³rdoba, Argentina. Here's what one of the adorable little beasties looks like up close:
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.