Advertisement Hi people. I live in Sydney, Australia and where I live, we have our own version of the Black Widow - the Redback Spider. I'm assuming that they are virtually identical, except the red dorsal marking which is only on the redbacks. I have pet redbacks and I find that I can relate to information about the Black Widows, which is very nice So here's my question: Are there any other differences between these two? (e.g. size, venom potency, habits etc) Can't seem to find any information on the internet.