The web of the black widow is extraordinarily strong. It has been known to snare animals as large as mice. Web threads are also used for crosshairs in rifle sights. Spiderlings contain a poisonous substance in their body tissue until they are about 18 days old, and can be especially toxic if ingested by pets and children. Spiderling toxin is different than the adult female venom.
Males possess venom sacs but they are small and nonfunctional as adults.
For more information , contact your county Extension office. Look in your telephone directory under your county's name to find the number.