 Among P. schultzi and some other Portias , when adults of the same species but opposite sexes recognise each other , they display at 10 to 30 centimetres . Males usually wait for 2 to 15 minutes before starting a display , but sometimes a female starts a display first . : 461 Portias sometimes use " propulsive displays " , with which a member threatens a rival of the same species and sex , and unreceptive females also threaten males in this way . : 343 A propulsive display is a series of sudden , quick movements including striking , charging , ramming and leaps . : 455 In P. schultzi and in some other species , contests between males usually last only 5 to 10 seconds , and only their legs make contact . : 466 Contests between Portia females are violent : 518 and embraces in P. schultzi typically take 20 to 60 seconds . These occasionally include grappling that sometimes breaks a leg , but more usually the final move is a lunge . Sometimes one knocks the other on her back and the other may be killed and eaten if she does not right herself quickly and run way . If the loser has a nest , the winner takes over and eats any eggs there . : 466 @-@ 467 
