it is really neat. I wiah I could remember the web site.

I will do a search to see if I can find it. they took jumping spiders and tested them with uv lights. they have realy neat looking chevron patterns on their faces they would point the light at one spider so it was lit and leave the other dark. the lit spider showed no interest in the dark one but the dark one began to display mating behavior as soon as the light hit the other spider and would lose interest when it was turned off. know that I think about it I am pretty sure I saw it on Nature on OPB not the internet.