The average black widow spider is far larger than the average redback spider. For example, redback spiders usually grow to less than half an inch in length, while black widow spiders grow anywhere ...

How to Identify the Redback Spider These are tiny spiders. Female redback spiders are about 0.4 inches (10 mm), while male redback spiders are much smaller, only about 0.11 to 0.16 inches (3 to 4 mm).

The redback spider (Latrodectus hasselti) is one of Australia's most iconic arachnids. It's a member of the widow spider family, closely related to the black widow spider. They're famous for their ...