Researchers at Duke University in Durham, North Carolina found eyes are less well adapted than birds to spot the distinctive red hourglass marks on the spiders' abdomens (shown).

This spider is not, I repeat not, a venomous black widow spider, though black and red she might be. Bill Campbell found her in a web across the entrance to his deck at the North End. “I thoug… ...

And then the female's bigger with the red dot on her abdomen that makes it so obvious to tell that she's a black widow," said Molly Mullen, spokesperson for Fontenelle Forest.These spiders aren't ...