 A "Portia" can pluck another spider's web with a virtually unlimited range of signals, either to lure the prey out into the open or calming the prey by monotonously repeating the same signal while the "Portia" walks slowly close enough to bite it.Such tactics enable "Portia" species to take web spiders from 10% to 200% of their size, and they hunt in all types of webs.In contrast, other cursorial spiders generally have difficulty moving on webs, and web-building spiders find it difficult to move in webs unlike those they build