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They periodically oscillate their hindwings, which causes the little tails to wiggle, and this, together with the "false eye" marking at the edge of the wings diverts the attention of predators away from the butterfly's head and body.
I spotted this at the base of Amedzofe Falls in the volta region of eastern Ghana.
Spotted on Jan 24, 2004
Submitted on Apr 24, 2011
and 63 other people favorited this spotting