Common tit (hypolycaena erylus teatus) Butterfly

This small butterfly is unusual but friendly. It has two feelers and 

two false legs at he back besides those at the front. The feelers 

would keep on moving and trying to sense the surroundings. The

false legs seemed to be dragged around, but occasionally used to 

balance the body when resting on the leave or my back pack.

I do not know what are the back features for. They look clumsy and unnecessary.