 However, "Portia" species are not very good at catching moving insects and often ignore them, while some other salticid genera, especially the quick, agile "Brettus" and "Cyrba", perform well against small insects.When a "Portia" stalks another jumping spider, the prey generally faces the "Portia" and then either runs away or displays as it does to another member of its own species.The webs of spiders on which "Portia" species prey sometimes contain dead insects and other arthropods which are uneaten or partly eaten.