The Latrodectus hasseltii (Redback Spider) is a venomous species of Spider indigenous to Australia, and commonly found in similar southern locations. It is given its common name due to the red mark on the back of the Adult Female. The Latrodectus hasseltii is a member of the cosmopolitan genus Latrodectus.
The adult female is easily recognizable by her round, black body with a red stripe prominent on the upper side of her abdomen, as well as an hourglass-shaped red/orange streak on the underside. The females have an average body length of 0.4 in (10 millimetres/1 centimetre). The female redback is mainly nocturnal, living in an untidy web in a warm sheltered area, commonly near or even inside human residences. It preys on insects and smaller spiders as well as small vertebrates that become ensnared in its web. To kill its prey, it injects an extremely complex venom through its two fangs when it bites, before wrapping them in silk and sucking out the liquefied innards.
Male spiders often live on the outer edges of the web or even the object the web is connected to, and steal leftovers from the female's web. Spiderlings have the same behavioral patterns, no matter what gender.