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This Ugandan jumping spider (top) would like you to think it's really a Tetraponera twig ant. Most birds and other vertebrate predators prefer not to eat stinging ants, so the spider may gain some protection from its fakery. 
Paul Decelles's profile photoAlex Wild's profile photoMichael Fenimore's profile photoSteve Esterly's profile photo
Another in the plethora of Ain't the animal kingdom awesome?
Are the front legs continuously held upright to mimic antennae?
+Jeremy Foote , usually the front legs are not only used to mimic the antennae but also used as sensors for finding prey.
Tai Mi
i love copycats like these!! so cool!
I'm loving seeing these jumping spiders that mimic ants, lately! That is just so cool!
Great mimic right down to the patterning on the legs.
Nice try, spider, but I notice you are lacking a petiole and thus are not an ant!! (Just learned about petioles and tubulation a moment ago over at +Bug Anatomy's post)
Hopefully potential spider predators (If that indeed is the selective pressure involved here) don't know about ant morphology... ;-)
Hats off to ya Mr Wild :)
Great stuff and well worth the mention.
And io9 quite rightly referred to you as "ever-excellent," +Alex Wild :)
Party on, Wayne. Party on, Garth.
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