Portia hunts animals that are usually better armed than it is: web-building spiders in their own webs. Its approach is correspondingly indirect. From a vantage point it scans the surroundings, then sets off on a path that may lead away from the prey, up a stem and along a branch, losing sight of the target for the whole journey.
On the web itself it uses aggressive mimicry. Portia plucks and shakes the silk, producing vibrations resembling a trapped insect, a courting male or wind. If one signal fails, it tries others, keeping those that draw the resident closer. Under a gust of wind it advances only while the web is already shaking, so its own steps go unnoticed.
What this amounts to is contested. Trial-and-error signalling and route selection can be produced by flexible rules, and most evidence comes from laboratory arenas rather than the forest.