Why Australia is hub of poisonous species?

Australia is home to some of the world's most venomous snakes, including the inland taipan and eastern brown snake. 

The Sydney funnel-web spider is another notable example, with a bite that can release a potent neurotoxin.

Blue-ringed octopuses and box jellyfish are also known for their potent toxins. 

Australia's high concentration of venomous species, including snakes, spiders, and other animals, is largely due to its isolation as a continent and the evolution of its fauna from a single, venomous ancestral lineage.

It's believed that the ancestral snake population on the supercontinent Gondwana, which later split into Australia and other continents, was primarily venomous.

When Australia got separated, these venomous snakes and other venomous species became isolated and continued to evolve along unique paths.

A significant portion of Australia's snakes belong to the elapid family, known for their venomous nature and hollow, fixed fangs.