mostly any spider depending one their size, their venomous, and their smartness
The Red Back spider is the only thing that can kill the cane toad
It can just be a red back spider...
a wolf spider. they hurt but are not deadly to humans
A spider.
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.
i think so yes the bite can cause a reaction where the flesh eats itself.
a red back.
A monkey spider. Ironically, it eats spider monkeys.
red back 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.
a spider.
red back