Red widow spiders have entirely red-brown bodies, with the exception of their black abdomen. ©Florida Division of Plant Industry Archive / CC BY 3.0 US, via Wikimedia Commons – Original ...

Spiders are some of the most diverse creatures on Earth. While they can be frightening, most of them are harmless and ...

Black widows are notorious spiders identified by the colored, hourglass-shaped mark on their abdomens. Several species answer to the name, and they are found in temperate regions around the world.

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.