The grey kangaroo lives in Australia. 
The eastern grey kangaroo lives in Australia. 
The eastern grey kangaroo lives in eastern Australia. 

The eastern grey kangaroo is a very common animal in Australia. 
These animals have a very special way of being parents. A mother kangaroo can use embryonic diapause to help her babies. This is a way to freeze the growth of a new embryo. She does this when there is a drought or little food. This helps her wait until the previous joey leaves the pouch. The mother can even make two different kinds of milk at once. One kind is for a newborn and one is for an older joey. 
Scientists have studied these kangaroos for a long time. George Shaw first described them in the year 1790. He gave them the scientific name Macropus giganteus. This name means "gigantic large-foot." There has been some debate about different groups of these kangaroos. For example, Albert Sherbourne Le Souef named a Tasmanian group in 1923. Some experts thought they were different subspecies based on coat color. However, a study in 2003 found very little genetic difference between them. 
Eastern grey kangaroos have many unique physical facts. An adult male can weigh around 90 kilograms. Females are usually smaller and weigh around 35 kilograms. They have a very powerful tail that can be over 1 meter long. The largest specimen ever examined by Lydekker was very huge. It weighed 135 kilograms and was 3.3 meters long. 
Knowing about kangaroos helps us understand the Australian land. They are very adaptable and can live near big cities. In 2010, there were about 11.4 million eastern grey kangaroos in Australia. They eat many kinds of grasses and forbs. They often live in groups of about three individuals. These groups help them watch for predators. Some people even think about using kangaroo meat to replace beef. Their soft feet are better for the ground than hard hooves. 
The eastern grey kangaroo, known scientifically as Macropus giganteus, is a large marsupial native to Australia. The name Macropus giganteus translates to "gigantic large-foot." This species is the second largest and heaviest living marsupial in Australia. It is also the second heaviest native land mammal on the continent. These animals are incredibly common because they are very adaptable to different environments. They are often found in the eastern third of Australia. 
Physically, the eastern grey kangaroo is easy to recognize by its soft grey or brownish-grey coat. They often have a lighter silver or cream belly. Their eyes appear large and wide open. Unlike the red kangaroo, they do not have black and white markings on their faces. They can be distinguished from western grey kangaroos by their color. Western greys are a darker, dusty brown with more contrast around the head.
Size varies significantly between males and females. An adult male commonly weighs around 90 kilograms. Females are smaller and typically weigh around 35 kilograms. Both sexes possess a powerful tail that can exceed 1 meter in length for males. Some specimens are remarkably large. One specimen examined by Lydekker weighed 135 kilograms. That individual measured 3.3 meters along its curves. 
History shows that George Shaw first described the species in 1790. There has been long-standing debate regarding subspecies. In 1923, Albert Sherbourne Le Souef identified a Tasmanian subspecies based on coat color. However, later studies have challenged this. In 1972, researchers Kirsch and Poole questioned the validity of these subspecies. A 2003 study used phylogenetic comparisons to show a lack of genetic differentiation. This suggested that the taxonomic status of these groups should be revised. 
These kangaroos have complex social and reproductive behaviors. They are gregarious animals that live in open-membership groups. These groups usually average three individuals. They follow a dominance hierarchy to access food and shade. They are also crepuscular, meaning they are most active at dawn and dusk. During the day, they rest in woodlands. They graze on a wide variety of grasses and forbs. 
Reproduction involves a fascinating process called embryonic diapause. This allows a female to freeze the development of an embryo. She does this during droughts or when food is scarce. This ensures she only continues development when conditions are right. A mother can even produce two different types of milk at once. She provides one kind for a newborn and another for an older joey. Joeys remain dependent on their mothers for about 550 days before weaning. 
In terms of population, the eastern grey is very successful. The estimated population in Australia was 11.4 million in 2010. They inhabit many areas, including coastal regions and mountain forests. Because they prefer fertile areas, they sometimes conflict with agriculture by eating crops. Some people even consider kangaroo meat as a replacement for beef. This is partly because their soft feet cause less soil erosion than hard hooves. 
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