Black widows are notorious spiders identified by the colored, hourglass-shaped mark on their ... The animals most at risk from the black widow's bite are insects—and male black widow spiders.

You also may see a brown widow spider, or Latrodectus geometricus, which is a close relative of black widows. It's tan and ...

Venom 15 times stronger than a rattlesnake — the black widow spider. What happens when it bites? All black with a red hourglass, just bigger than a paperclip. Only the female can bite humans.