What are the endemic animals in Australia?

Kangaroos have formed two powerful mammals in the history of biological evolution: marsupials and placental animals. Marsupials are extremely fertile, occupying an advantage in the world continent, and of course infiltrating into Australia. Later, geographical contact was interrupted, and placental animals continued to evolve until humans appeared. Almost all marsupials were replaced about 25 million years ago. However, in the world's "isolated island" Australia, marsupials are still multiplying, and "domestic animals" are also booming. The most representative marsupial is kangaroo, which Europeans call "kangaroo". Captain Cook, a British navigator, was very surprised when he explored the east coast of Australia for the first time in his life. The aborigines replied, "Kango Road." Therefore, Captain Cook called it "Kango Road", hence the name Kangaroo, and compiled it into the British dictionary. However, Captain Cook doesn't know that "Kango Road" means "don't know" in the indigenous language! Kangaroos can be found everywhere in Australia, with 50 species. The most common is a kind of red or gray kangaroo, whose length and weight are equivalent to those of adults, and some weigh more than 200 kilograms, but they are not clumsy at all; The smaller one is like a cat. Kangaroos are very interesting to make. As long as the mother mouse begins to clean her bag and carefully remove the impurities in the bag, this is the signal that she is about to give birth. After giving birth to the baby, the kangaroo, who has not opened her eyes, wriggled tenaciously and slowly from the tail of the mother mouse to the pouch. Kangaroos will live in bags for 9 months and then leave. When in trouble, it will get into its mother's bag to "take refuge". Kangaroos have strong jumping ability. When they go at full speed, their front legs curl up and their tails tilt up. Their hind legs make the whole body rush forward like steel springs, and the speed can reach 60 kilometers per hour! Some kangaroos are fierce by nature, and two male kangaroos can often be seen fighting on the vast grassland: two mice are facing each other, glaring, raising their neck hair, hissing in their mouths and sweeping each other with their tails. When one side is knocked to the ground, it is decided. Losers are only injured and rarely die. Interestingly, every fight will attract many kangaroos "spectators". They didn't take part in the war, just sat on the mountain and watched the mice fight. Kangaroos like to rest during the day and move at dusk. At night, kangaroos will mistakenly think that natural enemies are coming when they meet the headlights. At this time, they will rush out of the grass, jump on the road and desperately collide with the car. If they are not careful, cars are often knocked down by them. So in Australia, many cars are equipped with wreckers. In order to prevent this kind of collision, some roads have erected tall and eye-catching signs with kangaroos, warning drivers that kangaroos are ahead and should pay attention to safety. Kangaroos are full of treasures, and the meat is made into various delicious dishes; Leather is tough and soft, and can be made into exquisite suitcases, coats, belts, boots, baseball gloves, etc., which are favored by consumers. Kangaroo is the symbol and national treasure of Australia, and its image has been painted as the national emblem of Australia. Many people may ask, "Why do Australians give kangaroos such a lofty honor?" There are three reasons: first, kangaroo is the oldest prehistoric animal and unique in the world; Secondly, kangaroo is the tallest animal in Australia, and no one can match it. Third, kangaroos are docile, gentle and kind. Koala Among the marsupials in Australia, there is also a very lovable animal-koala, also called koala. It is reported that "koala" means "no drinking water" in the indigenous language. When the aborigines observed that this animal did not drink water for a long time, they took this name. "Koala" has a chubby baby face, a black nose, a pair of round eyes and two short furry ears, and a thick and dense layer of gray fur. It always looks so naive and funny. Although "koala" is called a bear, it actually has little to do with bears, but it has a bloated body and no tail, and looks similar to bears. "Koala" has a gentle nature and is not easy to get angry. Once angered by fire, it will cry like a baby, which is really pitiful. In Australia, the reputation of koala is comparable to that of giant panda in China. It always gives people a feeling of joy, peace and stability, so Australians like to give koala toys to friends and guests. "Koala" has short legs. When it is fully grown, it is about 60 cm high and weighs 10 kg. Its claws are very sharp, and every five toes are divided into two rows, one row is two, and the other row is three, so it can hold the trunk tightly. Its "unique skill" is to jump from one branch to another a few meters away, which is agile and flexible. Interestingly, the koala's tail degenerates into a "cushion" after a long time, so it can sit comfortably in the tree for a long time. "Koala" has only one baby per child. After the baby "koala" is born, it will immediately get into the mother's abdominal bag to suck milk. When it grows to about 15 cm, it will reluctantly leave its mother's bag. A koala's schoolbag is different from a kangaroo's. The pocket mouth faces backwards. Once the bear leaves the pouch, it can't go in again. In Australia, wherever people see koalas, they almost always sit on the branches and doze off. Although koala is an animal, people seldom see it walk. Because it is afraid of meeting people, it never comes down from the tree for food and doesn't need to drink water, so it sits on the tree all day and never does any "little tricks", just keeps chewing eucalyptus leaves. There are many koalas in Lynch, Eucalyptus, Queensland and Victoria. They eat eucalyptus leaves, from which they can get enough water, so they can survive without drinking water. An emu who has carefully observed the national emblem of Australia will find a kangaroo on the left and an emu on the right. Emu can walk angrily on the national emblem because it is the largest bird in Australia. Emu is the largest land bird in the world. It looks like an ostrich in the African desert, but it is taller than an ostrich. Its height is about 1.5 meters, and its weight varies from tens of kilograms. From the point of view of animal taxonomy, it should belong to a kind of ostrich. Emu likes to live in grasslands, forests and desert areas. It is covered with brown feathers and is good at running, with a speed of 70 kilometers per hour and can fly hundreds of kilometers. Although the emu has wings, it has completely degenerated into an ostrich and cannot fly. However, it can swim calmly and cross wide and swift rivers. Emu is hungry, but its appearance has always maintained the shape of prehistoric times, which puzzles some zoologists. Emu seldom walk alone, either in pairs or in groups of three or five. During the breeding season, females lay eggs, 7- 15 at a time, and the responsibility for incubating eggs is borne by males. For two and a half months, the male bird patiently performed his duties until the little emu came out of its shell and the cry of new life echoed in the blue sky ... The emu was friendly and never pecked unless provoked. It doesn't care about food either. It mainly feeds on grass, and also likes to eat some grass butterflies and insects. In wildlife reserves, emus can often improve their food and eat bread, sausages and biscuits fed by tourists. A car was parked on the side of the road, and the EMU was unprepared. On the contrary, it will swagger over and scramble to put its head into the window. One is to show its closeness to you, and the other is to hope that you can give something delicious. The platypus is a monophyletic animal in Australia, and the most peculiar is the platypus. The so-called monotremes refers to an animal between reptiles and mammals. Although more advanced than reptiles, it has not yet evolved into mammals. The similarity between the two is that they both breathe with their lungs, have long hair and are full of blood; Monopore animals reproduce by laying eggs, so they retain the important characteristics of reptiles. Everyone who has seen platypus says it looks really strange. When British immigrants entered Australia and found platypus, they exclaimed that it was an "incredible animal". The platypus is about 40 cm long, with soft short hair, short limbs, hooked claws on five toes and webbed toes, which looks like duck feet. Male platypus has thorns on its hind feet. It stores poisonous juice, which will hurt people when sprayed, just like snake venom. This is its amulet. Platypus is an amphibian and usually likes to make holes in the water. When in the water, its eyes, ears and nose are closed, and it only feeds on shellfish by perception. It eats a lot, and consumes food equivalent to its own weight every day. The platypus pursues mating in the water, and its eggs are like turtle eggs. After hatching, platypus can only go out for food by breastfeeding for 4 months. The platypus's biological clock is reversed. They are used to sleeping during the day and exercising at night. Hundreds of millions of years have passed, and the platypus has not become extinct, nor has it evolved much. It has been wandering in the "transitional stage". This kind of animal, which is only produced in Australia, is really strange and mysterious, full of mystery.