Found in local garages and yards, the female black widow spider is considered the most venomous spider in North America. The venom of the black widow spider is very toxic. Only the female black widow is dangerous to humans. They have a reddish hourglass shape on the underside of their abdomens and they like to live underneath our stuff. Did you know the female black widow will sometimes kill and eat the male after mating? Ouch! What’s lurking in your garage? venompest.net.