 When hunting a web spider in the prey 's web , a P. schultzi walks very slowly towards the prey and then , when two to three centimetres away , pauses for some minutes . During this time the P. schultzi quivers very quickly with its whole body at regular intervals . In almost all cases the prey stays motionless . P. schultzi never plucks the web as Portia fimbriata does . : 37 
