The redback spider is the Australian spider known for a red stripe and a potentially dangerous venomous bite.
Female redbacks are much larger than males and usually have a prominent red or orange marking on the abdomen. They build irregular, tangled webs in sheltered locations such as sheds, outdoor furniture, rock crevices and woodpiles.
The species’ venom contains neurotoxins that can produce severe pain and other symptoms in humans. An antivenom has been available since 1956, and modern medical treatment has greatly reduced the danger of serious outcomes. Bites are most likely when a spider is accidentally disturbed.
Redbacks are found throughout Australia and have also been introduced to some other regions. They are related to widow spiders, including the black widow of North America, but they are a distinct Australian species.