 When hunting , mature females of P. labiata , P. africana , P. fimbriata and P. schultzi emit olfactory signals that reduce the risk that any other females , males or juveniles of the same species may contend for the same prey . The effect inhibits aggressive mimicry against a prey spider even if the prey spider is visible , and also if the prey is inhabiting any part of a web . If a female of one of these Portias smells a male of the same species , the female stimulates the males to court . These Portia species do not show this behaviour when they receive olfactory signals from members of other Portia species . 
