 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 A Portia often builds her own web on to one of a web @-@ based non @-@ salticid spider . When not joined to another spiders ' , a P. fimbriata female 's capture web is generally suspended from rigid foundations such as boughs and rocks . : 432 Males of Portia do not build capture webs . : 429 
