#29 Black Widow Spiders
Black widow spiders can look harmless at first glance with their small size. Their bite, however, proves deadly. Black widow venom is so powerful that it is 15 times more potent than a rattlesnake’s.
If you have been bitten by a black widow spider – made clear through red hourglass marks on its stomach – then you need immediate medical attention in order to avoid a fatality. With the right medical care, the bite can become harmless, but it’s a close call.