why do unique animals exist in australia

Marsupials Australia has more than 140 species of marsupials, including kangaroos, wallabies, koalas, and wombats. We have 55 different native species of kangaroos and wallabies. Kangaroos and wallabies vary greatly in size and weight, ranging from half a kilogram to 90 kilograms. The main difference between them is size wallabies tend to be smaller. Estimates of Australias kangaroo population vary between 30 and 60 million. You should easily be able to see kangaroos in the wild in most rural parts of Australia. In Victoria see them in Anglesea on the
and in. Spot them in South Australias and. Get up close in and Kosciuszko National Parks in the, in Pebbly Beach in New South Wales and Tasmanias Maria Island. In outback regions, you will often see them as they bound across the road.

Wallabies are widespread across Australia, particularly in more remote, rocky and rugged areas. Spot them in South Australias Flinders Ranges, Tasmanias and in Namadgi and Kosciuszko National Parks in the Australian Alps. The koala is everyones favourite, but be aware its not a bear. You can spot koalas all along Australias temperate eastern coast. Some of their top hangouts include , near Canberra; Port Stephens in New South Wales and the Lone Pine Koala Sanctuary in Queensland. Observe them in the wild on Victorias Phillip Island and Yanchep National Park in Western Australia. The wombat is another creature youll find here stout, burrowing animals that can weigh up to 36 kilograms. Again they are difficult to see in the wild, but some of the best places are the and Kosciuszko National Park in New South Wales, in Victoria, Cradle Mountain-Lake St Clair in Tasmania, and in national parks in South Australia.

What Kind of Animals Live in Australia? Australia has the most unusual native animals in the world. Over 90 percent of the mammals, 7 percent of the birds, 88 percent of the reptiles and 94 percent of the frogs are unique to Australia. Australia's long isolation from the rest of the world has allowed Australian animals to evolve separately from those in other parts of the world, but to fill similar niches in the environment. For example the Echidna is an Australian Anteater. The Tasmanian Tiger (now extinct) was a marsupial wolf. The existence of similar animals in different parts of the world is referred to as.

There are three types of mammals in Australia. These are monotremes, marsupials and placentals. first appeared between 145в99 million years ago and are the oldest type of Australian mammals. Two out of the five known species of monotremes in the world live in Australia. These are the and. appeared about 64-65 million years ago and are the second oldest type of mammal found in Australia. They occupy every niche of the Australian habitat and range from the large Red to marsupials of the smaller than a mouse. mammals are relatively recent arrivals to Australia. were the first to arrive getting here about 23 million years ago. Rodents arrived about 5-10 million years ago. These animals reached Australia by flying and crossing the seas that separated Australian from Asia when Australia slowly stated drifting closer to Asia making crossings to the continent possible.

These placental mammals make up a very small percentage of the total mammalian population. Humans introduced a number of animals. The was the first of these, coming here about 5,000 years ago. Australia has many amphibians and reptiles found nowhere else in the world. Lizards There are over 700 species unique to Australia alone. Snakes Australia has more poisonous snakes than non-poisonous ones. The is one. Frogs Four families of native frogs inhabit the continent. Crocodiles Australia has two species of crocodile. The is the world's largest and can grow to 1,000 kilos and is known to attack humans.

Fresh water crocodiles are much smaller and do not attack humans. Turtles There are 35 species of freshwater turtles. Six species of sea turtle also visit the coastlines. Australia has 800 species of birds, 350 are found only in Australasia. Ratites such as the and, which are large flightless birds similar to the ostrich. Megapods as the Mallee fowl, trace their ancestry as far back as Gondwanan time. These birds are stocky birds which look somewhat like chickens. They have small heads and large feet (that's why the name megapod meaning big-feet). Parrots unique to Australia comprise nearly 20% of the world's know species. These include the and the almost extinct. Other birds such as are the world's largest kingfishers.