 While most jumping spiders prey mainly on insects and by active hunting , : 340 females of Portia also build webs to catch prey directly . These capture webs are funnel @-@ shaped and widest at the top : 513 and are about 4 @,@ 000 cubic centimetres in volume . : 429 – 431 The web is initially built in about 2 hours , and then gradually made stronger . : 239 A Portia often joins her own web on to one of a web @-@ based non @-@ salticid spider . : 432 When not joined to another spiders ' , a P. labiata female 's capture web may be suspended from rigid foundations such as boughs and rocks , or from pliant bases such as stems of shrubs . : 432 
