They are similar to the black widows but they do not live in North America with black widows but they live in Australia
Red back spiders live under rocks, in logs, under rubble and rubbish ,amoung rocks and in sheds
Usually on or near the females web
It can just be a red back spider...
the red back spider can live up to 1 year to 3
a wolf spider. they hurt but are not deadly to humans
A spider.
Australia
The spider that is black with a white crescent on its back is the Brown House Spider. This spider is often confused with the red-back spider.
a red back.
It is the most deadlyest spider apart from the red back...it is its cousin...the crizone spider
A black widow spider is black with a red mark on it's abdomen; this might or might not be what you meant. The black widow sometimes has a red mark on her back, as well. The red backed spider of Australia, a relative of the black widow, has an orange red mark on the back.
The Red-back spider (Latrodectus hasselti) is commonly found in Australia. They are a small black venomous spider with long thin legs, and the females have a red stripe on their globular abdomen.