Here's why black widows are so deadly

January 12, 2015 3:15 PM

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Here's why black widows are so deadly

Dr. Jonathan A. Coddington holds a jar of preserved Black Widow Spiders at the Smithsonian Institution National Museum of Natural History in Washington, Wednesday, March 30, 2011. (AP Photo/Carolyn Kaster)

Black widow spiders are known for their lethal venom, but just how did they get so deadly? Apparently by evolving quickly over the years during their pursuit of "ever-bigger prey," Discovery reports.

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