2 of Australia's Most Venomous Spiders

Australia is home to many fear provoking spiders and we home some of the most venomous spiders in the world, all of which are very widely distributed.

Redback spider and eggs on piece of wood

However, don’t fear too much - bites are actually infrequent and not as life-threatening as we tend to believe. The most venomous of the species are more scared of us than we are of them and you probably have not come across one in your lifetime in Australia.

If you do come across dangerous spiders, it is good to be equipped with some knowledge of them and what you should do. Read below to learn about the two most common venomous spiders in Australia that people see or interact with and what you should do.


Don’t be fooled by the totally black or orange back spiders as these are also redbacks. Their web is often untidy and is full of leaves and grass etc. Small as a pea or sometimes smaller, they hide in dark places like;

  • Letterboxes
  • Outdoor furniture
  • Near BBQs
  • Pot plants

Their bite is painful and you should definitely get medical attention ASAP as the poisonous venom, although it moves very slowly, can cause;

  • Headaches
  • Nausea
  • Vomiting
  • Abdominal pain
  • Hypertension
  • Paralysis

Best thing for you to do while waiting for medical attention is;

  • Not bandage or restrict around the bite
  • Stay calm and still
  • Use an ice-pack

Funnel Web

The most iconic of the venomous spiders is the large 25-30mm Funnel web spider who can often be found wandering around gardens or homes, especially after heavy rain or earthworks that drive them from their resting places. While there are many species of Funnel Webs, only a few are particularly venomous.

They prefer to hide in places like;

  • Clothing or shoes left on the ground
  • Swimming pools
  • Under leaves or objects in the garden

As the Funnel Web spider is known as one of the world’s most deadly spiders, it is important to keep an eye out for them - especially on hot humid nights when the males are searching for a mate. When bitten you will need an anti-venom so seeking medical attention is critical.

The bite will cause;

  • Great pain
  • Nausea and abdominal pain 
  • Difficulty in breathing 
  • Weakness or numbness of muscles
  • Body secretes heavily
  • Profuse sweating
  • Excessive saliva production
  • Heavy coughing

Best thing for you to do while waiting for medical attention is; apply pressure/ immobilisation to the site ASAP.

If you suspect that your business or home has a Funnel Web or Redback spiders, CDI Pest Management can attend your premises and carry out an expert assessment and treatment.