Some jumping spiders of the genus "Portia" hunt other spiders in ways that seem intelligent, outflanking their victims or luring them from their webs. Laboratory studies show that "Portia"'s instinctive tactics are only starting points for a trial-and-error approach from which these spiders learn very quickly how to overcome new prey species. However, they seem to be relatively slow thinkers, which is not surprising as their brains are vastly smaller than those of mammalian predators.