black widow spider's venom

It is unclear how this virus can get the spider's DNA (and some other animals), but scientists think the virus does so to make it easier to infect. .

The black widow spider undergoes a 7-fold molting process in life during periods of development when the outer skeleton becomes too cramped.

Black widow spider bites can cause symptoms such as swelling, muscle pain, shortness of breath, nausea, fever and death.