The Box Jellyfish The box jellyfish is a very dangerous creature to inhabit the Australian waters. The Jellyfish has extreme toxins present on its tentacles, which when in contact with a human, can stop cardio-respiratory functions in as little as three minutes. This jellyfish is responsible for more deaths in Australian than Snakes, Sharks and Salt Water Crocodiles. The creature has a square body and inhabits the north east areas of Australia. The tentacles may reach up to 80 cms in length. It is found along the coast of the Great Barrier Reef.
The Irukandji Jellyfish The Irukandji Jellyfish inhabits Northern Australian waters. This is a deadly jellyfish, which is only 2.5 centimetres in diameter, which makes it very hard to spot in the water. This is a species of jellyfish which has become known about in recent years, due to deaths of swimmers in Australia. In 2002, Richard Jordon was stung whilst swimming off the coast of Hamilton Island. He was a 58 year old British tourist, unfortunately he died a few days later.
The Saltwater Crocodile The Saltwater Crocodile is the world’s largest reptile. These amazing creatures are found on the northern coast of Australia and inland for up to 100 kms or more. The Saltwater Crocodile has been reported to grow to lengths of 7 metres, but the average size of a Saltwater Crocodile is 4 metres long. The crocodile is now a protected species in Australia. The saltwater crocodile is extremely fast, and it is, of course, an excellent swimmer and an expert at camouflage. Crocodiles can actually outrun a horse over short distances.
The Blue Ring Octopus The Blue Ring Octopus is a deadly venomous octopus which inhabits warm waters and shallow reefs off the coast of Australia. It also lives off the coast of New Guinea, Indonesia and the Philippines. This octopus has distinctive blue rings on its body and eight tentacles. With the tentacles spread, it is about 20 cms in diameter.
The Stone-fish The Stone fish inhabit shallow waters along the coast. The stone fish is well camouflaged in the ocean, as it is a brownish colour, and often resembles a rock. It has thirteen sharp dorsal spines on its back, which each have extremely toxic venom. People swimming in the ocean need to take care, as they can unknowingly step on a Stone fish and have venom injected into their foot.
The Red Back Spider The Red Back Spider is Australia’s most well known deadly spider. They are found all over Australia, and are common in urban areas. The Black Widow Spider is a close relative of the Red Back. These spiders are usually found under logs, rocks, bricks, sheds and outdoor toilets.The Red Back These spiders are small in size, the females being about 1cm long and the males about 4mm long. Only the female red back spider bite is dangerous to humans.
The brown snake The brown snake is approximately 1.5 metres long, and is one of Australia’s more deadly creatures. They have venom which can cause death to humans relatively quickly if left untreated. Brown snakes up to 2.3 metres have been recorded in Australia. These snakes are found in Eastern Australia, however they are not found in Tasmania.
The Great White Shark They are solitary animals, but have also been reported to swim in pairs or groups. They are found on all coasts of Australia, and furthermore throughout the World. They range between 3.5 to 5 metres long, and weigh on average 1,300kg. The females are large than males. They have on average 2,800 teeth in their mouth, all in rows and triangle in shape. They can even tackle small whales. They attack their prey once, and then wait and let their prey bleed to death. They have an amazing sense of smell, and can pick up blood in water a long way away.
The Funnel-web Spider The Funnel-web Spider is is the most dangerous spider in Australia, and among the most dangerous spiders in the world.They are found from northern New South Wales to southern Queensland, usually in heavily timbered areas which are rarely entered by man. A small dose of poison can be lethal to humans. The male of this spider is five times more dangerous than the female.
The Tiger snake The common tiger snake is found in southern and eastern Australia. They are usually around a meter long, and have a striped marking. This is not always the case however, as the markings can change due to the seasons and the age of the snake. They can grow up to 1.5 metres in length. These are venomous snakes, and will attack if they are disturbed or threatened. They are also found in suburban areas, even in the newer suburbs.
The Box Jellyfish 
The Irukandji Jellyfish
The Saltwater Crocodile 
The Stone-fish 
The Red Back Spider 
The brown snake 
The Great White Shark 
The Funnel-web Spider
The Tiger snake