 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 cm3 in volume . : 429 @-@ 431 The web is initially built in about 2 hours , and then gradually made stronger . : 239 A Portia spider often joins her own web on to one of a web @-@ based <unk> spider . When not joined to another spiders ' , a P. schultzi 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 Males of Portia do not build capture webs . : 429 
