Western Black Widow
Females are the most venomous spiders in North America, but seldom cause human death. Venom causes severe pain in local regional muscles, then is carried through the bloodstream to cause muscle contractions and cramps. Also causes nausea and vomiting, sometimes insomnia and shock.
Spin erratic, but their silk is the strongest of any arachnid.
They suck nutrients out of their prey.
Females sometimes kill males after breeding.
They can lay up to 400 eggs at one time.
Some of their predators include wasps and praying mantis.