From wikipedia:  jumping spider that mimics the Kerengga or weaver ant (Oecophylla smaragdina) in morphology and behaviour. Found in India, Sri Lanka, China and many parts of Southeast Asia.  The spiders live in trees and bushes where the weaver ants live in colonies. By mimicking the ants they are able to stay close to them and gain protection from predators since weaver ants have a painful bite and also taste bad.  The Kerengga Ant-like Jumper also mimics ant-like behaviour by the style of locomotion and by the way they wave their front legs like antennae to mimic the ants.