Animals

Snakes There are many venomous snakes, but few are aggressive, unless you have the bad fortune to step on one. However, it is highly unlikely to be bitten by a snake.

If you are bitten do not wash the wound - a swab will be taken by the hospital so the exact antivenom can be administered.
if bitten on the hand, strap up the arm with bandages - to stop the venom moving (do not cut off the circulation).
Sit back and don't move. If possible remember what the snake looks like and describe it to the ambulance people

Spiders Funnel-web, redback, and white-tail spiders are all deadly.
The Redback is found everywhere but the funnel web is found in the southern and eastern states.

Flies and mosquitoes are always a bother, but just bring your bug spray and invest in the Genuine Aussie Fly Net when exploring areas heavily populated with insects.

Scorpions, Bull-ants and wasps their sting or bite is normally not harmful (unless allergic) but may cause pain and discomfort.

Ticks Check your skin for lumps each night.
Ticks should be removed by dousing it with methylated spirits or kerosene and promptly removed with tweezers keeping it intact.

Blue-ringed octopus Commonly found in rock pools all over Australian states. Their bite can paralyse in 15 minutes resulting in death. Unless provoked the distinctive blue rings of this dangerous octopus may not be evident.

Box jellyfish (Marine Stingers) appear during summer (October to May) north of Great Keppel Island and Queensland.
A sting from their long tentacles can be lethal (though not always) By the time you see the jellyfish, you're likely to have been stung already. Douse stings with vinegar. Costal beaches North of Rockhampton are prohibited at this time.

Stone Fish Poisonous stinging fish, found all around the northern coastline, beaches badly affected are normally signposted. Reduce chances of being stung by not turning over coral and rocks and wearing sand shoes.

Sharks Need I say more?

Only that If you want to avoid them;
stay out of the water at dusk and dawn,
avoid beaches where sharks are known to congregate (most patrolled beaches have shark nets),
avoid water that becomes abruptly deeper,
avoid areas of low visibility and turbid water.

Flood

In some remote areas , floods can occur, and after the start to the year in Queensland (what with Cyclone Steve) I thought I had better put this in..

Floods can occur without warning. Do not camp in dry river beds or too close to edges of creeks or streams.

Always exercise extreme caution when approaching flooded roads or bridges.

If you are caught in a flash flood there is a good chance you will lose some possessions and maybe the car , however you life is far more important so get onto higher ground.

If you cannot keep your feet after leaving the car, swim or float with the fast moving water, not against it and look out for a projecting embankment or an overhanging limb to help you. (you've all seen Indiana Jones!)

Bushfire

If you have to travel on days of critical fire danger (that is total fire ban days), make sure you carry some woollen blankets and a filled water container.

If you are trapped and a bushfire approaches; Do not panic.

Stop the car in the nearest cleared area.

Wind up all the windows.

Turn on the hazard lights to warn any other traffic.

Do not get out of your car. The temperature may become unbearably hot, but it is still safer to stay in your car.

Lie on the floor, below window level to avoid radiant heat.

Cover yourself and your passengers with blankets.

The car will not explode or catch fire, and a fast moving wild fire will pass quickly overhead.