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The Australian flag has the animals Emu and Kangaroo because they always move forwards never backwards. Also Kangaroos are the largest marsupial mammals they belong to the Macropodidae family. A Kangaroo moves by hopping on its hind legs and using its tail for steering and balancing while hopping at the speed up to 40mph to 60kmh. When kangaroos are moving slowly their tail is used as an extra leg and supports the kangaroo when their standing on their hind legs. Most people don't know but kangaroos can only move their back legs together and not one at a time. Kangaroos are found in Australia, Tasmania, and New Guinea. They are grazing animals that means they eat grass, young shoots and leaves of heath plants as well as grass trees. Kangaroos need very little water to survive and are capable of going for months without drinking at all. A male kangaroo is called a buck. it can also be commonly known as a "boomer" or an "old man". A female kangaroo is called a doe, or a flyer. A baby kangaroo is called a joey. Kangaroos have good eyesight but their eyes only respond to moving objects. They have excellent hearing and can they swivel their large ears in all directions just to pick up sounds. Kangaroos are social animals that live in groups or "mobs" of at least two or three individual kangaroos and up to 100 kangaroos. Kangaroos usually have one young annually. The joey remains in the pouch for nine months and continues to suckle until the age of twelve to seventeen months of age. Also Kangaroos can have 3 babies at one time. One becoming mature and just out of the pouch, another developing in the pouch and one embryo in pause mode. There are 4 teats in the pouch and each provides different milk for the different stages of development.

The Eastern Grey Kangaroo

They are sometimes known as the "Forester" as the Eastern grey kangaroo is the heaviest marsupial in the world.
Males are larger than females (rarely exceed 45kg.) The Eastern grey kangaroo live in small groups but may congregate in large numbers when
It is usually active from late afternoon until early morning,when resting in the shade of some trees or shrubs during the day. 

Strong, muscular legs propel the animal across the grasslands at speeds of 40 mph or 60kmh. They are able to go clear lengths of 25 feet (8 meters) and heights of 9 feet (3 meters). The Eastern grey kangaroos generally give birth to one infant at a time but twins have been reported. A single young weighing less than 0.35oz (1gr) was born after a pregnancy of 36 days. The joey leaves the pouch for short periods in about nine months of age, but continues to suckled until it is at least 18 months of age. The Eastern grey kangaroo estimate population in 1996 was around about 10'000'000. Eastern grey kangaroos distributed throughout most of the eastern third of the Australian continent, especially along the coast in damp forest and scrub. It has increased in numbers since European settlement due to pasture improvement, and the provision of watering points for stock.