Drop Bears.
http://www.geocities.com/muirnin/db.htm
"Habitat
The Common Drop Bear is usually to be found in the Tall Forests of Victoria and South Australia. One such example is the town of Glenburn in Victoria, due to the numerous reports of drop bears it has resulted in a drop in the population because residents feared for their lives and fled. Drop Bears are also known to inhabit the Mangrove Swamps of the Northern Territory and Queensland. The animals like to spend most of the time in the tree tops. This gives them a good launching spot for a drop upon unsuspecting prey, an activity which led to their common name. Drop Bears are notoriously hard to spot whilst in their natural habitat as their fur camouflages well with the olive grey hue of the foliage. [Note: other variations of Drop Bear have been recorded with characteristics which are more suited to their differing habitats. These include the rare Snow Drop Bear (white fur), the Lesser Aquatic Drop Bear (mottely blue) and the Shallow Water Drop Bear (aqua blue fur)]
Deispite its name the Shallow Water Drop Bear is not restricted to just shallow waters, it can also swim out to sea. This special type of Drop Bear poses a major threat to sharks and boats (the Shallow Water Drop Bear's favourite foods). The Shallow Water Drop Bear can be canibal, at times a veggitarian and at other times it can be an omnivore (it will even eat sand) this type of Drop Bear is not to be confused with Sea Monkeys. "
"Prey
The primary prey of Drop Bears are unsuspecting tourists, often Welsh or German but usually US American or Japanese. It is commonly understood that the Bears favour those with cameras, due to the entrancing reflection of the sun's rays from the glass lenses on a typical Aussie scorcher of a day. It is not true that Drop Bears are merely mesmerized by their reflections in the instruments or harbour a conscious or unconscious desire to be photographed. There is no truth in the rarely misquoted assertion that they wish to be "at one with the lens". It is a well known fact that the Australian Government would have banned tourism long ago had it not been for the fact that with no tourists, the drop bears would have been forced to feed on Australians.
Other factors are responsible for causing the natives of some countries to be more attractive then others to Drop Bears. When lost in the Australian bush, German tourists are known to excrete a musky odour (apparently a fear response) which has been shown to attract Drop Bears from up to 5km (approx 3 miles) away. "
From here
http://uncyclopedia.wikia.com/wiki/Drop_Bear
Every Aussie I know repeats the drop bear story to any tourist they meet, even family from OS. Then there's the Hoop Snake....