It’s only the female black widow, with her red-marked abdomen, that delivers a venomous bite. Male black widows are much smaller than the females, and are usually light brown instead of black. Although black widows usually don’t spin webs inside homes, it’s common to find them on webs around the backyard or garage, particularly in woodpiles, behind boxes or planters or in any other dry, dark hidden spot. A female black widow’s bite is very painful, though very rarely fatal. Still, this is one spider you don’t want around your home.