 Portias hunt in all types of webs ,: 491 while other cursorial spiders generally have difficulty moving on webs, and web-building spiders find it difficult to move in webs unlike those they build .: 424 Where the web is sparse, a Portia will use "rotary probing", in which it moves a free leg around until it meets a thread .: 433-434 When hunting in another spider's web, a Portia ′ s slow, choppy movements and the flaps on its legs make it resemble leaf detritus caught in the web and blown in a breeze .: 514 P. schultzi and some other Portias use breezes and other disturbances as "smokescreens" in which these predators can approach web spiders more quickly, and revert to a more cautious approach when the disturbance disappears .: 313 A few web spiders run far away when they sense the un-rhythmical gait of a Portia entering the web - a reaction Wilcox and Jackson call "Portia panic" .: 418
